Polyurethanes made from hydroxy-methyl containing fatty acids or alkyl esters of such fatty acids
Polyurethane polymers are made from a reaction mixture that contains a polyisocyanate, a hydroxylmethyl-containing fatty acid or ester, and another polyol, polyamine or aminoalcohol. The carboxylic acid or ester group on the hydroxymethyl-containing fatty acid or ester are capable of engaging in a variety of reactions with the polyisocyanate and/or amine or hydroxyl groups present in the reaction mixture. This allows for good quality, high molecular weight polymers to be produced even though the hydroxymethyl-containing fatty acid or ester tends to be a low functionality material.
1. A process for preparing a polyurethane, comprising forming a reaction mixture comprising at least one polyisocyanate, a fatty acid having an average of at least 0.8 hydroxymethyl group per molecule and a terminal carboxylic acid group, and at least one polyol, polyamine or aminoalcohol compound, and curing the reaction mixture to form a polyurethane polymer.
2. The process of claim 1 , wherein the fatty acid contains 10 to 26 carbon atoms.
3. The process of claim 2 , wherein the fatty acid is a mixture of materials selected from materials having structures A1, A2, A3, A4 and A5, wherein A1 is:
wherein m is number greater than 3, n is greater than or equal to zero and m+n is from 8 to 22, A2 is:
wherein v is a number greater than 3, r and s are each numbers greater than or equal to zero with v+r+s being from 6 to 20, A3 is:
wherein v, each r and s are as defined before, t is a number greater than or equal to zero, and the sum of v, r, s and t is from 5 to 19, A4 is
where w is from 10 to 24, and A5 is
where R′ is a linear or branched alkyl group that is substituted with at least one cyclic ether group and optionally one or more hydroxyl groups or other ether groups.
4. The process of claim 3 , wherein the reaction mixture contains an adduct of a tertiary amine catalyst and at least a portion of the fatty acid, which adduct is a delayed action or heat-activated catalyst.
5. A process for preparing a polyurethane, comprising forming a reaction mixture comprising at least one polyisocyanate, an unsubstituted alkyl ester of a fatty acid having an average of at least 0.8 hydroxymethyl group per molecule and having 12 to 26 carbon atoms, and at least one polyol or polyamine compound, and curing the reaction mixture to form a polyurethane polymer, wherein the alkyl ester of the fatty acid is a mixture of materials selected from materials having structures A1, A2, A3, A4 and A5, wherein A1 is:
wherein R is an unsubstituted alkyl group, m is number greater than 3, n is greater than or equal to zero and m+n is from 8 to 22, A2 is:
wherein R is as before, v is a number greater than 3, r and s are each numbers greater than or equal to zero with v+r+s being from 6 to 20, A3 is:
wherein R, v, each r and s are as defined before, t is a number greater than or equal to zero, and the sum of v, r, s and t is from 5 to 18, A4 is
where R is as before and w is from 10-24, and A5 is
where R is as before and R′ is a linear or branched alkyl group that is substituted with at least one cyclic ether group and optionally one or more hydroxyl groups or other ether groups.
6. The process of claim 3 , wherein the polyol, polyamine or aminoalcohol includes a polyether or polyester polyol having an equivalent weight of at least 400.
7. The process of claim 3 , wherein the polyol, polyamine or aminoalcohol includes at least one material having an equivalent weight of from 30 to 200.
8. The process of claim 5 , wherein the reaction mixture contains at least one catalyst that catalyzes a urethane-forming reaction and a transesterification or amidization reaction.
9. The process of claim 3 , wherein the reaction mixture contains at least one organotin catalyst.
10. The process of claim 8 , wherein the polyurethane polymer is post cured at an elevated temperature to form ester and/or amide groups between the ester group of the hydroxymethyl-containing fatty acid ester and an amino or hydroxyl group of the polyol, polyamine or aminoalcohol.
11. The process of claim 3 , wherein the reaction mixture contains a blowing agent, and the polyurethane polymer is cellular.
12. The process of claim 3 , wherein the polyurethane polymer is elastomeric.
13. The process of claim 5 , wherein the polyol or polyamine compound includes a polyether or polyester polyol having an equivalent weight of at least 400.
14. The process of claim 5 , wherein the polyol or polyamine compound includes at least one material having an equivalent weight of from 30 to 200.
15. The process of claim 5 , wherein the reaction mixture contains at least one organotin catalyst.
16. The process of claim 5 , wherein the reaction mixture contains a blowing agent, and the polyurethane polymer is cellular.
17. The process of claim 5 , wherein the polyurethane polymer is elastomeric.