Process for the production of rigid foam resins which contain predominantly isocyanurate ring structures

Claim 2

A RIGID FOAM RESIN COMPRISING PREDOMINANTLY ISOCTANURATE RING STRUCTURES PREPARED BY A PROCESS WHICH COMPRISES REACTING AN AROMATIC POLYISOCYANATE IN THE PRESENCE OF AN ISOCYANATE TRIMERIZATION CATALYST, A BLOWING AGENT, AND A POLYHYDROXYL COMPOUND, CHARACTERIZED IN THAT A COMPOUND OF THE FORMULA:

Claim 3

A rigid foam resin comprising predominantly isocyanurate ring structures prepared by a process which comprises reacting an aromatic polyisocyanate in the presence of an isocyanate trimerization catalyst, a blowing agent, and, a polyhydroxyl compound, characterized in that an alkyl ester of a member selected from the group consisting of: 3,5-diaminobenzoic acid, 4-chloro-3,5-diamino benzoic acid, and 4-methyl-3,5-diamino benzoic acid, is included in the reaction mixture in a quantity of from about 0.2 to about 20 parts by weight based on 100 parts by weight of polyisocyanate, wherein the amount of polyhydroxyl compound used is such that a sufficient quantity of isocyanate groups remain for the trimerization reaction, and wherein from 50 to 100% of said remaining isocyanate groups are polymerized to isocyanurate groups.

Claim 4

A rigid foam resin comprising predominantly isocyanurate ring structures prepared by a process which comprises reacting an aromatic polyisocyanate in the presence of an isocyanate trimerization catalyst, a blowing agent, and, a polyhydroxyl compound, characterized in that an alkyl ester of a member selected from the group consisting of: 3,5-diaminobenzoic acid, 4-chloro-3,5-diamino benzoic acid, and 4-methyl-3,5-diamino benzoic acid, is included in the reaction mixture in a quantity of from about 0.2 to about 20 parts by weight based on 100 parts by weight of polyisocyanate, wherein the amount of polyhydroxyl compound used is such that a sufficient quantity of isocyanate groups remain for the trimerization reaction, and wherein from 50 to 100% of said remaining isocyanate groups are polymerized to isocyanurate groups.

Claim 5

A rigid foam resin comprising predominantly isocyanurate ring structures prepared by a process which comprises reacting an aromatic polyisocyanate in the presence of an isocyanate trimerization catalyst, a blowing agent, and, a polyhydroxyl compound, characterized in that a (di) alkylated tolylene-2,4-diamine is included in the reaction mixture in a quantity of from about 0.2 to about 20 parts by weight based on 100 parts by weight of polyisocyanate, wherein the amount of polyhydroxyl compound used is such that a sufficient quantity of isocyanate groups remain for the trimerization reaction, and wherein from 50 to 100% of said remaining isocyanate groups are polymerized to isocyanurate groups.

Claim 6

A rigid foam resin comprising predominantly isocyanurate ring structures prepared by a process which comprises reacting an aromatic polyisocyanate in the presence of an isocyanate trimerization catalyst, a blowing agent, and, a polyhydroxyl compound, characterized in that a (di) alkylated tolylene-2,4-diamine is included in the reaction mixture in a quantity of from about 0.2 to about 20 parts by weight based on 100 parts by weight of polyisocyanate, wherein the amount of polyhydroxyl compound used is such that a sufficient quantity of isocyanate groups remain for the trimerization reaction, and wherein from 50 to 100% of said remaining isocyanate groups are polymerized to isocyanurate groups.