High resilient flexible urethane foam and flexible molded foams based on allophanate modified isocyanates
AssigneeBayer Aktiengesellschaft
InventorsNeil H. Nodelman, Karl W. Haider, William E. Slack
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Abstract
This invention relates to a process for the preparation of a flexible foam. This process comprising reacting a liquid, storage stable, allophanate-modified polyisocyanate having an NCO group content of about 20 to about 42%, with an isocyanate-reactive component, in the presence of a blowing agent and at least one catalyst, wherein the relative amounts of the polyisocyanate and the isocyanate-reactive component are such that the NCO index if from about 70 to about 130.
Claims28
A process for the production of a flexible foam comprising
- (A) reacting
- (1) a liquid, storage stable, allophanate-modified polyisocyanate having an NCO group content of from about 20 to about 42%, and which comprises the reaction product of
- (a) a polyisocyanate, and
- (b) a compound selected from the group consisting of 1,2-propylene glycol and 1,3-butanediol;
- with
- (2) an isocyanate-reactive component comprising at least one compound which contains isocyanate-reactive groups;
- in the presence of
- (3) a blowing agent;
- and
- (4) at least one catalyst;
- wherein the reaction is conducted at an isocyanate index of from about 75 to about 115.
A flexible foam comprising the reaction product of:
- (1) a liquid, storage stable, allophanate-modified polyisocyanate having an NCO group content of from about 20 to about 42%, and which comprises the reaction product of:
- (a) a polyisocyanate, and
- (b) a compound selected from the group consisting of 1,2-propylene glycol and 1,3-butanediol;
- with
- (2) an isocyanate-reactive component comprising at least one compound which contains isocyanate-reactive groups;
- in the presence of
- (3) a blowing agent;
- and
- (4) at least one catalyst;
- wherein said components are present in quantities such that the isocyanate index is from about 75 to about 115.
A process for the production of a flexible molded foam comprising:
- (A) reacting
- (1) a liquid, storage stable, allophanate-modified polyisocyanate having an NCO group content of from about 20 to about 42%, and which comprises the reaction product of:
- (a) a polyisocyanate, and
- (b) a compound selected from the group consisting of 1,2-propylene glycol and 1,3-butanediol;
- with
- (2) an isocyanate-reactive component comprising at least one compound which contains isocyanate-reactive groups;
- in the presence of
- (3) a blowing agent:
- and
- (4) at least one catalyst;
- wherein the reaction is conducted at an isocyanate index of from about 75 to about 115.
A flexible molded foam comprising the reaction product of:
- (1) a liquid, storage stable, allophanate-modified polyisocyanate having an NCO group content of from about 20 to about 42%, and which comprises the reaction product of:
- (a) a polyisocyanate, and
- (b) a compound selected from the group consisting of 1,2-propylene glycol and 1,3-butanediol;
- with
- (2) an isocyanate-reactive component comprising at least one compound which contains isocyanate-reactive groups;
- in the presence of
- (3) a blowing agent;
- and
- (4) at least one catalyst;
- wherein said components are present in quantities such that the isocyanate index is from about 75 to about 115.
Dependencies are inferred from the claim text.