Polyol compositions for hot melt adhesives

Abstract

Disclosed are polyether and polyesters polyol condensations. The polyols are uniquely suited for ease of manufacture and improved adhesive characteristics particularly for low surface energy materials. The materials can be used in urethane adhesives.

I claim: 
     
         1 . A method for the synthesis of a capped polymeric polyol, the method comprising the steps of:
 (a) combining a polymeric polyol, having a molecular weight greater than 500, the polyol comprising a starter compound and repeating units of an alkylene oxide, with a glycidyl ether or ester compound at a ratio of one glycidyl compound per each active hydroxyl group in the polymeric polyol, to form a mixture; and   (b) reacting the mixture to form the capped material.   
     
     
         2 . A method for the synthesis of a capped polyester polyol, the method comprising the steps of:
 (a) combining a polyol from a carboxylic acid with a carboxyl functionality of two or more and a hydroxyl compound with a hydroxyl functionality of two or more to form a polyester polyol having a molecular weight of at least 500 with a glycidyl ether or ester compound at a ratio of one glycidyl compound per each active hydroxyl group in the polymeric polyol, to form a mixture, and   (b) reacting the polyester polyol to form the capped material.   
     
     
         3 . A polyester polyol compound comprising a polyester polyol having a molecular weight greater than 500 with at least one end cap formed from a reaction of an active hydrogen in the polyester polyol with a glycidyl compound. 
     
     
         4 . A polyether polyol compound comprising a polyether polyol 1 having a molecular weight greater than 1000 with at least one end cap formed from a reaction of an active hydrogen in the polyether polyol with a glycidyl compound. 
     
     
         5 . A polyether polyol compound comprising a polyether polyol 1 having a molecular weight greater than 500 with at least one end cap formed from a reaction of an active hydrogen in the polyether polyol with a glycidyl compound. 
     
     
         6 . The polyol of  claim 5  wherein the polyester comprises a substantially linear aliphatic polyester. 
     
     
         7 . The polyol of  claim 6  wherein the aliphatic polyester comprises the polymerization as esterification reaction product of a dicarboxylic acid and a diol. 
     
     
         8 . The polyol of  claim 6  wherein the polyester comprises a substantially linear polyester made from an aromatic dicarboxylic acid in a diol. 
     
     
         9 . The polyol of  claim 5  wherein the glycidyl to compound comprises a glycidyl ether or glycidyl ester. 
     
     
         10 . The polyol of  claim 9  wherein the glycidyl ester comprises a carboxylic acid ester having 5 to 20 carbon atoms. 
     
     
         11 . The polyol of  claim 10  wherein the glycidyl ester comprises a compound of formula: 
       
         
           
           
               
               
           
         
       
       wherein, R6 and R7 are typically linear or branched hydrocarbyl or alkyl groups having from about one to about 20 carbon atoms. 
     
     
         12 . The polyol of  claim 11  wherein the total carbon content of the branched alkali group of the acid group of the glycidyl ester is such from about 9 to about 15 carbon atoms. 
     
     
         13 . A method for the synthesis of a capped polyester polyol, the method comprising the steps of:
 (a) forming a polyol from a aliphatic carboxylic acid with a carboxyl functionality of two or more and an aliphatic hydroxyl compound with a hydroxyl functionality of two or more to form a polyester polyol having a molecular weight of at least 500 by reacting the acid with the hydroxyl compound, at temperature greater than 190° C., to form a reaction mixture, until the acid number of the reaction mixture is less than 0.5: and   (b) reacting the polyester polyol with a glycidyl ester at a temperature greater than 140° C. to form the capped material.   
     
     
         14 . A polyurethane adhesive material comprising an isocyanate compound and a glycidyl capped polyether polyester polyol. 
     
     
         15 . The polyurethane adhesive material of  claim 14  wherein the isocyanate compound is MDI and the polyol is the polyol of  claim 11 .