Shaped articles from orientable polymers and polymer microbeads

Abstract

Disclosed is a shaped article comprising a continuous oriented polymer matrix having dispersed therein microbeads of a polymer which are at least partially boredered by void space, the microbeads being present in an amount of about 5-50% by weight based on the weight of said oriented polymer, said void space occupying about 2-60% by volume of said shaped article. Preferably, the microbeads are cross-linked to an extent they will be resilient and elastic at the orientation temperature, and are coated with a slip agent. The shaped article is preferably in the form of a sheet, fibers, or other molded article, preferably has a relatively low specific gravity and whiteness.

We claim: 
     
       1. A shaped article selected from the group .[.comprising.]. .Iadd.consisting of .Iaddend.films, sheets, bottles, tubes, fibers and rods wherein said article comprises a continuous oriented polymer phase selected from the group .[.comprising.]. .Iadd.consisting of ep polyesters and polypropylene having dispersed therein microbeads of a cross-linked polymer coated with a slop agent and which are at least partially bordered by void space .Iadd.formed from substantially closed cells so that substantially no open fluid transport path extends across opposed sides of said article.Iaddend., said microbeads being present in an amount of about 5-50% by weight based on the weight of said oriented polymer, said void space occupying about 2-60% by volume of said shaped article wherein said cross-linked polymer comprises polymerizable organic material which is a member selected from the group consisting of an alkenyl aromatic compound having the general formula ##STR4## wherein Ar represents an aromatic hydrocarbon radical, or an aromatic .[.halohydracarbon.]. .Iadd.halohydrocarbon .Iaddend.radical of the benzene series and R is hydrogen or the methyl radical; acrylate-type monomers include monomers of the formula ##STR5## wherein R is selected from the group consisting of hydrogen and an alkyl radical containing from about 1 to 12 carbon atoms and R' is selected from the group consisting of hydrogen and methyl; copolymers of vinyl chloride and vinylidene chloride, acrylonitrile and vinyl chloride, vinyl bromide, vinyl esters having the formula ##STR6## wherein R is an alkyl radical containing from 2 to 18 carbon atoms; acrylic acid, methacrylic acid, itaconic acid, citraconic acid, maleic acid, fumaric acid, oleic acid, vinylbenzoic acid; the synthetic polyester resins which are prepared by reacting terephthalic acid and dialkyl terephthalics or ester-forming derivatives thereof, with a glycol of the series HO(CH 2 ) n  OH, wherein n is a whole number within the range of 2-10 and having reactive olefinic linkages within the polymer molecule, the hereinabove described polyesters which include copolymerized therein up to 20 percent by weight of a second acid or ester thereof having reactive olefinic unsaturation and mixtures thereof, and a cross-linking agent selected from the group consisting of divinylbenzene, diethylene glycol dimethacrylate, oiallyl fumarate, diallyl phthalate and mixtures thereof. 
     
     
       2. A shaped article according to claim 1, .[.the composition of which when consisting only of said continuous phase and said microbeads at least partially bordered by void space is characterized by.]. .Iadd.having a composition, which when consisting only of said continuous phase and said microbeads at least partially bordered by void space, is characterized by .Iaddend.having a specific gravity of less than 1.20 and a Kubelka-Munk R value (infinite thickness) of about 0.90 to about 1.0 and the following Kubelka-Munk values when formed into a 3 mil thick film:   ______________________________________                                    
Opacity          about 0.78 to about 1.0                                  
SX               25 or less                                               
KX               about 0.001 to 0.2                                       
T (i)            about 0.02 to 1.0                                        
______________________________________                                    
     
     
     
       3. A shaped article according to claim 1 wherein said oriented polymer phase is poly(ethylene terephthalate) having an I.V. of at least 0.50. 
     
     
       4. A shaped article according to claim 1 wherein said oriented polymer phase is a polyester having repeat units from terephthalic acid or naphthalene dicarboxylic acid and at least one glycol selected from the group consisting of ethylene glycol, 1,4-butanediol and 1,4-cyclohexanedimethanol. 
     
     
       5. A shaped article according to claim 1 wherein said oriented polymer phase is polypropylene. 
     
     
       6. A shaped article according to claim 1 wherein said slip agent is selected from silica and alumina. 
     
     
       7. A shaped article according to claim 1 wherein said microbeads have an average diameter of about 0.1-50 microns. 
     
     
       8. A shaped article according to claim 1 wherein said void spaces surround said microbeads, said void spaces being oriented such that they lie in generally the same or parallel planes. 
     
     
       9. A shaped article according to claims 1, 2, 3, 4,.5, 6, 7 or 8 wherein said article is a fiber or rod of about 0.5-50 mils diameter. 
     
     
       10. A shaped article according to claims 1, 2, 3, 4, 5, 6, 7, or 8 wherein said article is a tube. 
     
     
       11. A shaped article according to claims 1, 2, 3, 4, 5, 7 or 8 wherein said article is a paper-like sheet. 
     
     
       12. A shaped article according to claim 1, 2, 3, 4, 5, 7 or 8 wherein said article is a bottle. 
     
     
       13. A paper-like sheet comprising a continuous phase of oriented polyester having dispersed therein micro-beads of crosslinked polymer coated with a slip agent which are encircled by void space .Iadd.formed from substantially closed cells so that substantially no open fluid transport path extends across opposed sides of said paper-like sheet .Iaddend.when viewed in a direction perpendicular to the plane of the sheet, (a) said polyester having a Tg of about 60°-100° C. and an I.V. of at least 0.50,   (b) said crosslinked polymer comprises polymerizable organic material which is a member selected from the group consisting of an alkenyl aromatic compound having the general formula ##STR7## wherein Ar represents an aromatic hydrocarbon radical, or an aromatic .[.halohydracarbon.]. .Iadd.halohydrocarbon .Iaddend.radical of the benzene series and R is hydrogen or the methyl radical; acrylate-type monomers include monomers of the formula ##STR8## wherein R is selected from the group consisting of hydrogen and an alkyl radical containing from about 1 to 12 carbon atoms and R' is selected from the group consisting of hydrogen and methyl; copolymers of vinyl chloride and vinylidene chloride, acrylonitrile and vinyl chloride, vinyl bromide, vinyl esters having the formula ##STR9## wherein R is an alkyl radical containing from 2 to 18 carbon atoms; acrylic acid, methacrylic acid, itaconic acid, citraconic acid, maleic acid, fumaric acid, oleic acid, vinylbenzoic acid; the synthetic polyester resins which are prepared by reacting terephthalic acid and dialkyl terephthalics or ester-forming derivatives thereof, with a glycol of the series HO(CH 2 ) n  OH, wherein n is a whole number within the range of 2-10 and having reactive olefinic linkages within the polymer molecule, the hereinabove described polyesters which include copolymerized therein up to 20 percent by weight of a second acid or ester thereof having reactive olefinic unsaturation and mixtures thereof, and a cross-linking agent selected from the group consisting of divinylbenzene, diethylene glycol dimethacrylate, oiallyl fumarate, diallyl phthalate and mixtures thereof,   (c) said microbeads having an average diameter of about 0.1-50 microns and being present in an amount of about 5-50% by weight based on the weight of said polyester, and   (d) said void space occupying about 2-60% by volume of said sheet.   
     
     
       14. A paper-like sheet according to claim 13 wherein said slip agent is selected from silica and alumina. 
     
     
       15. A fiber or rod comprising a continuous phase of oriented polyester having dispersed therein microbeads comprising crosslinked polymer coated with a slip agent.Iadd., wherein said microbeads are .Iaddend.bounded on the lengthwise sides by void space .Iadd.formed from substantially closed cells so that substantially no open fluid transport path extends across opposed sides of said fiber or said rod (a) said oriented polyester having a Tg of about 60°-100° C. and an I.V. of at least 0.50,   (b) said microbeads having an average diameter of about 0.1-50 microns and accounting for 10-30% by weight of said .[.sheet.]. .Iadd.fiber or said rod.Iaddend.ol , and   (c) said void space occupying about 2-60% by volume of said fiber or rod.   
     
     
       16. A fiber or rod according to claim 15 wherein said crosslinked polymer comprises polymerizable organic material which is a member selected from the group consisting of an alkenyl aromatic compound having the general formula ##STR10## wherein Ar represents an aromatic hydrocarbon radical, or an aromatic halohydrocarbon radical of the benzene series and R is hydrogen or the methyl radical; acrylate-type monomers include monomers of the formula ##STR11## wherein R is selected from the group consisting of hydrogen and an alkyl radical containing from about 1 to 12 carbon atoms and R' is selected from the group consisting of hydrogen and methyl; copolymers of vinyl chloride and vinylidene chloride, acrylonitrile and vinyl chloride, vinyl bromide, vinyl esters having the formula ##STR12## wherein R is an alkyl radical containing from 2 to 18 carbon atoms; acrylic acid, methacrylic acid, itaconic acid, citraconic acid, maleic acid, fumaric acid, oleic acid, vinylbenzoic acid; the synthetic polyester resins which are prepared by reacting terephthalic acid and dialkyl terephthalics or ester-forming derivatives thereof, with a glycol of the series HO(CH 2 ) n  OH, wherein n is a whole number with the range of 2-10 and having reactive olefinic linkages within the polymer molecule, the hereinabove described polyesters which include copolymerized therein up to 20 percent by weight of a second acid or ester thereof having reactive olefinic unsaturation and mixtures thereof, and a crosslinking agent selected from the group consisting of divinylbenzene, diethylene glycol dimethacrylate, oiallyl fumarate, diallyl phthalate and mixtures thereof. 
     
     
       17. A fiber or rod according to claim 16 wherein said slip agent is selected from silica and alumina.