Polyester resin, compositions thereof and sealant made therefrom

Abstract

A polyester resin (A) having branched chain, a reduction viscosity (η sp/c) of not less than 0.7, and a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3 and not more than 800×10 3 , a polyester resin composition comprised of resin (A) and a polyester resin (B) without branched chain and having a reduction viscosity (η sp/c) of not less than 0.7., and a polyester resin composition comprised of resin (A) and a polyester resin (C) having branched chain and a melting point lower than that of the polyester resin (A). The sealant made from the polyester resin (A), or the resin compositions of the present invention is superior in heat-sealing properties, flavor retention, and film moldability (extrusion processing characteristics), and is suitable for a sealant for paper and plastic food containers.

What is claimed is: 
     
       1. A polyester resin having branched chain, a reduction viscosity (η sp/c) of not less than 0.7, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more than 800×10 3 , an acid component comprising an aromatic dicarboxylic acid in a proportion of from about 95 mole percent to about 100 mole percent relative to the entire acid component, said aromatic dicarboxylic acid comprising terephthalic acid in an amount ranging from about 60 mole percent to about 90 mole percent, and said polyester resin having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component. 
     
     
       2. A polyester resin having branched chain, a reduction viscosity (η sp/c) of not less than 0.8, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 280×10 3  and not more than 600×10 3 , an acid component comprising an aromatic dicarboxylic acid in a proportion of from about 95 mole percent to about 100 mole percent relative to the entire acid component, said aromatic dicarboxylic acid comprising terephthalic acid in an amount ranging from about 60 mole percent to about 90 mole percent, and said polyester resin having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component. 
     
     
       3. A polyester resin composition comprised of a polyester resin (A) having branched chain, a reduction viscosity (η sp/c) of not less than 0.7, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more than 800×10 3 , and said polyester resin (A) having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component, and a polyester resin (B) without branched chain and having a reduction viscosity (η sp/c) of not less than 0.7. 
     
     
       4. A polyester resin composition according to claim 3, wherein the ratio of the polyester resin (A) and the polyester resin (B), (A)/(B), is 95/5-40/60. 
     
     
       5. A polyester resin composition comprised of a polyester resin (A) having branched chain, a reduction viscosity (η sp/c) of not less than 0.7, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more than 800×10 3 , and said polyester resin (A) having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component, and a polyester resin (C) having branched chain, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more than 800×10 3 , and a melting point lower than that of the polyester resin (A). 
     
     
       6. A polyester resin composition according to claim 5, wherein the ratio of the polyester resin (A) and the polyester resin (C), (A)/(C), is 95/5-60/40. 
     
     
       7. A polyester resin composition comprised of a polyester resin (A) having branched chain, a reduction viscosity (η sp/c) of not less than 0.7, a Z average molecular weight (Mz) relative to standard polystyrene of not less that 250×10 3  and not more than 800×10 3 , and said polyester resin (A) having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component, and a polyester resin (C) having branched chain and a melting point lower than that of the polyester resin (A) in a mixing weight ratio of (A)/(C)=95/5-60/40. 
     
     
       8. A sealant made from a polyester resin having branched chain, a reduction viscosity (η sp/c) of not less than 0.7, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more that 800×10 3 , an acid component comprising an aromatic dicarboxylic acid in a proportion of from about 95 mole percent to about 100 mole percent relative to the entire acid component, said aromatic dicarboxylic acid comprising terephthalic acid in an amount ranging from about 60 mole percent to about 90 mole percent, and said polyester resin having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component. 
     
     
       9. A sealant made from a polyester resin having branched chain, a reduction viscosity (η sp/c) of not less than 0.8, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 280×10 3  and not more than 600×10 3 , an acid component comprising an aromatic dicarboxylic acid in a proportion of from about 95 mole percent to about 100 mole percent relative to the entire acid component, said aromatic dicarboxylic acid comprising terephthalic acid in an amount ranging from about 60 mole percent to about 90 mole percent, and said polyester resin having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component. 
     
     
       10. A sealant made from a polyester resin composition comprised of a polyester resin (A) having branched chain, a reduction viscosity (η sp/c) of not less than 0.7, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more than 800×10 3 , and said polyester resin (A) having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component, and a polyester resin (B) without branched chain which has a reduction viscosity (η sp/c) of not less than 0.7. 
     
     
       11. A sealant made from a polyester resin composition comprised of a polyester resin (A) having branched chain, a reduction viscosity (η sp/c) of not less than 0.7, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more than 800×10 3 , and said polyester resin (A) having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component, and a polyester resin (C) having branched chain and a melting point lower than that of the polyester resin (A). 
     
     
       12. A polyester comprising the following components: a. an acid component comprising an aromatic dicarboxylic acid in a proportion of from about 95 mole percent to about 100 mole percent relative to the entire acid component, said aromatic dicarboxylic acid comprising terephthalic acid in a proportion of from about 60 mole percent to about 90 mole percent relative to the entire acid component and an aliphatic and/or alicyclic dicarboxylic acid in a proportion of less than 5 mole percent relative to the entire acid component;   b. a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component, and less than 10 mole percent glycols relative to the entire glycol component selected from the group consisting of diethylene glycol, 1,4-butanediol, propylene glycol, and 1,4-cyclohexanedimethanol; and   c. a compound having 3 or more functional groups selected from the group consisting of polycarboxylic acid, polyol, and oxycarboxylic acid in a proportion of from about 0.1 mole percent to about 1.5 mole percent relative to either the entire acid component or the entire glycol component. .Iadd.   
     
     
       13.  A polyester resin having branched chain, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more than 800×10 3 , an acid component comprising an aromatic dicarboxylic acid in a proportion of from about 95 mole percent to about 100 mole percent relative to the entire acid component, said aromatic dicarboxylic acid comprising terephthalic acid in an amount ranging from about 60 mole percent to about 90 mole percent, and said polyester resin having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component. .Iaddend..Iadd.14. A polyester resin having branched chain, a Z it average molecular weight (Mz) relative to standard polystyrene of not less than 280×10 3  and not more than 600×10 3 , an acid component comprising an aromatic dicarboxylic acid in a proportion of from about 95 mole percent to about 100 mole percent relative to the entire acid component, said aromatic dicarboxylic acid comprising terephthalic acid in an amount ranging from about 60 mole percent to about 90 mole percent, and said polyester resin having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component. .Iaddend..Iadd.15. A polyester resin composition comprised of a polyester resin (A) having branched chain, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more than 800×10 3 , and said polyester resin (A) having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component, and a polyester resin (B) without 
     
     
        branched chain. .Iaddend..Iadd.16.  A polyester resin composition according to claim 15, wherein the ratio of the polyester resin (A) and the polyester resin (B), (A)/(B), is 95/5-40/60. .Iaddend..Iadd.17. A polyester resin composition comprised of a polyester resin (A) having branched chain, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more than 800×10 3 , and said polyester resin (A) having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component, and a polyester resin (C) having branched chain, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more than 800×10 3 , and a melting point lower than that of the polyester resin (A). .Iaddend..Iadd.18. A polyester resin composition according to claim 17, wherein the ratio of the polyester resin (A) and the polyester resin (C), (A)/(C), is 95/5-60/40. .Iaddend..Iadd.19. A polyester resin composition comprised of a polyester resin (A) having branched chain, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more than 800×10 3 , and said polyester resin (A) having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component, and a polyester resin (C) having branched chain and a melting point lower than that of the polyester resin (A) in a mixing weight ratio of (A)/(C)=95/5-60/40. .Iaddend..Iadd.20. A sealant made from a polyester resin having branched chain, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more than 800×10 3 , an acid component comprising an aromatic dicarboxylic acid in a proportion of from about 95 mole percent to about 100 mole percent relative to the entire acid component, said aromatic dicarboxylic acid comprising terephthalic acid in an amount ranging from about 60 mole percent to about 90 mole percent, and said polyester resin having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component. .Iaddend..Iadd.21. A sealant made from a polyester resin having branched chain, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 280×10 3  and not more than 600×10 3 , an acid component comprising an aromatic dicarboxylic acid in a proportion of from about 95 mole percent to about 100 mole percent relative to the entire acid component, said aromatic dicarboxylic acid comprising terephthalic acid in an amount ranging from about 60 mole percent to about 90 mole percent, and said polyester resin having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component. .Iaddend..Iadd.22. A sealant made from a polyester resin composition comprised of a polyester resin (A) having branched chain, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more than 800×10 3 , and said polyester resin (A) having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component, and a polyester resin (B) without 
     
     
        branched chain. .Iaddend..Iadd.23.  A sealant made from a polyester resin composition comprised of a polyester resin (A) having branched chain, a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250×10 3  and not more than 800×10 3 , and said polyester resin (A) having a glycol component comprising ethylene glycol in a proportion of from about 90 mole percent to about 100 mole percent relative to the entire glycol component, and a polyester resin (C) having branched chain and a melting point lower than that of the polyester resin (A). .Iaddend.