Rim elastomers with improved catalyst efficiency

Claim 2

In a method for making a reaction injection molded polyurethane elastomer wherein a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate are reacted in the presence of a single tin catalyst or mixture of tin catalysts and wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate the improvement which comprises mixing all of the tin catalyst or mixture of tin catalysts with the polyisocyanate component prior to reaction.

Claim 3

A method as in claim 1 wherein the polyol comprises a polyether of about 5000 molecular weight based on a trihydric initiator.

Claim 4

A method as in claim 1 wherein the polyisocyanate comprises 4,4'diphenylmethane diisocyanate.

Claim 5

A method as in claim 1 wherein the elastomer is postcured at about 325° F.

Claim 6

In a method for making a reaction injection molded polyurethane elastomer wherein a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate comprising 4,4'diphenylmethane diisocyanate are reacted in the presence of a single tin catalyst or mixture of tin catalysts and wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate the improvement which comprises mixing all of the tin catalyst or mixing tin catalysts with the polyisocyanate component prior to reaction.

Claim 7

In a method for making a reaction injection molded polyurethane elastomer wherein a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate comprising 4,4'diphenylmethane diisocyanate are reacted in the presence of a single tin catalyst or mixture of tin catalysts and wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate the improvement which comprises mixing all of the tin catalyst or mixing tin catalysts with the polyisocyanate component prior to reaction.

Claim 8

In a method for making a reaction injection molded polyurethane elastomer wherein a polyhydric polyether of about 5000 molecular weight based on the trihydric initiator, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate comprising 4,4'diphenylmethane diisocyanate are reacted in the presence of a single tin catalyst or mixture of tin catalysts and wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate improvement which comprises mixing all of the tin catalyst or mixture of tin catalysts with the polyisocyanate component prior to reaction.

Claim 9

In a method for making a reaction injection molded polyurethane elastomer wherein a polyhydric polyether of about 5000 molecular weight based on the trihydric initiator, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate comprising 4,4'diphenylmethane diisocyanate are reacted in the presence of a single tin catalyst or mixture of tin catalysts and wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate improvement which comprises mixing all of the tin catalyst or mixture of tin catalysts with the polyisocyanate component prior to reaction.

Claim 10

A method as in claim 6 wherein the elastomer is postcured at about 325° F.

Claim 11

In a method for making a reaction injection molded polyurethane elastomer wherein a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate are reacted in the presence of a mixture of tin catalysts and wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate the improvement which comprises mixing all of the tin catalyst mixture with the polyisocyanate component prior to reaction.

Claim 12

In a method for making a reaction injection molded polyurethane elastomer wherein a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate are reacted in the presence of a mixture of tin catalysts and wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate the improvement which comprises mixing all of the tin catalyst mixture with the polyisocyanate component prior to reaction.

Claim 13

A method as in claim 8 wherein the polyol comprises a polyether of about 5000 molecular weight based on a trihydric initiator.

Claim 14

A method as in claim 8 wherein the polyisocyanate comprises 4,4'diphenylmethane diisocyanate.

Claim 15

A method as in claim 8 wherein the elastomer is postcured at about 325° F.

Claim 16

In a method for making a reaction injection molded polyurethane elastomer wherein a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate comprising 4,4'diphenylmethane diisocyanate are reacted in the presence of a mixture of tin catalysts and wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate the improvement which comprises mixing all the tin catalyst mixture with the polyisocyanate component prior to reaction.

Claim 17

In a method for making a reaction injection molded polyurethane elastomer wherein a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate comprising 4,4'diphenylmethane diisocyanate are reacted in the presence of a mixture of tin catalysts and wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate the improvement which comprises mixing all the tin catalyst mixture with the polyisocyanate component prior to reaction.

Claim 18

In a method for making a reaction injection molded polyurethane elastomer wherein a polyhydric polyether of about 5000 molecular weight based on the trihydric initiator, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate comprising 4,4'diphenylmethane diisocyanate are reacted in the presence of a mixture of tin catalysts wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate improvement which comprises mixing all of the tin catalyst mixture with the polyisocyanate component prior to reaction.

Claim 19

In a method for making a reaction injection molded polyurethane elastomer wherein a polyhydric polyether of about 5000 molecular weight based on the trihydric initiator, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate comprising 4,4'diphenylmethane diisocyanate are reacted in the presence of a mixture of tin catalysts wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate improvement which comprises mixing all of the tin catalyst mixture with the polyisocyanate component prior to reaction.

Claim 20

A method as in claim 13 wherein the elastomer is postcured at about 325° F.

Claim 21

In a method for making a reaction injection molded polyurethane elastomer wherein a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate comprising 4,4'diphenylmethane diisocyanate are reacted in the presence of a single tin catalyst and wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate the improvement which comprises mixing all of the tin catalyst with the polyisocyanate component prior to reaction.

Claim 22

In a method for making a reaction injection molded polyurethane elastomer wherein a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate comprising 4,4'diphenylmethane diisocyanate are reacted in the presence of a single tin catalyst and wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate the improvement which comprises mixing all of the tin catalyst with the polyisocyanate component prior to reaction.

Claim 23

A method as in claim 15 wherein the polyol comprises a polyether of about 5000 molecular weight based on a trihydric initiator.

Claim 24

A metod as in claim 15 wherein the elastomer is postcured at about 325° F.

Claim 25

In a method for making a reaction injection molded polyurethane elastomer wherein a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate are reacted in the presence of a single tin catalyst and wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate the improvement which comprises mixing all the tin catalyst with the polyisocyanate component prior to reaction.

Claim 26

In a method for making a reaction injection molded polyurethane elastomer wherein a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate are reacted in the presence of a single tin catalyst and wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate the improvement which comprises mixing all the tin catalyst with the polyisocyanate component prior to reaction.

Claim 27

In a method for making a reaction injection molded polyurethane elastomer wherein a polyhydric polyether of about 5000 molecular weight based on the trihydric initiator, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate comprising 4,4'diphenylmethane diisocyanate are reacted in the presence of a single tin catalyst wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate improvement which comprises mixing all of the tin catalyst with the polyisocyanate component prior to reaction.

Claim 28

In a method for making a reaction injection molded polyurethane elastomer wherein a polyhydric polyether of about 5000 molecular weight based on the trihydric initiator, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate comprising 4,4'diphenylmethane diisocyanate are reacted in the presence of a single tin catalyst wherein these ingredients are separated into two components prior to reaction and wherein one component contains all of the polyisocyanate improvement which comprises mixing all of the tin catalyst with the polyisocyanate component prior to reaction.

Claim 29

A method as in claim 19 wherein the elastomer is postcured at about 325° F.