Polyisocyanurate foam, catalyst composition and process for producing such

A process for producing a polyisocyanurate foam comprising the steps of:

• I. admixing at one point from three separate sources:
• A. a mixture of polymethylene polyphenyl isocyanates of Formula I, wherein n is an integer from 0 to 8 and the polyisocyanates have an equivalent weight of 120 to 180 and a functionality of 2.1 to 3.2 and the mixture has a viscosity of 250 to 2500 centipoises at 25.degree.C,
• B. ethylene glycol or diethylene glycol, wherein the ration of A:B is in the range of 3:1 to 5:1,
• C. a catalyst composition comprising:
• 1. potassium 2-ethyl hexoate
• 2. polyoxyethylene glycol having a molecular weight of 200 to 300 wherein the weight ratio of potassium 2-ethyl hexoate to polyoxyethylene glycol is in the range of 1:2 to 1:6,
• 3. 2, 4 6-tris (dimethylaminomethyl) phenol, 200 to 800 centipoises at 25.degree.C, and is present to an extent of 0.1 to 2 weight percent of the polyisocyanurate foam,
• in the presence of fluorotrichloromethane present to an extend of 5 to 20 weight percent of the polyisocyanurate foam,
• in the presence of polydimethylsiloxane-polyoxyalkylene block copolymers present ot an extent of 0.1 to 2 weight percent of the polyisocyanurate foam,
• Ii. applying continuously the mixture comprising A, B, and C to a moving substrate, and then,
• Iii. recovering the polyisocyanurate foam adhering to the substrate.

A process for producing a polyisocyanurate foam comprising the steps of:

• I. admixing at one point from separate sources:
• A. an organic polyisocyanate,
• B. a diol having an equivalent weight of 30 to 100,
• C. a catalytic composition comprising:
• 1. an alkali metal carboxylate which is a saturated aliphatic mono-carboxylic acid salt of an alkali metal,
• 2. a compound of Formula IV:
• HO--(CH.sub.2 CH.sub.2 O--).sub.n H IV
• wherein n is an integer from 3 to 10 inclusive,
• Ii. applying continuously the mixture comprising A, B, and C to a moving substrate, and then,
• Iii. recovering the polyisocyanurate foam adhering to the substrate
• wherein the equivalent ratio of A:B is 2:1 to 6:1,
• wherein the catalytic composition comprises from 0.01 to 5 weight percent of the polyisocyanurate foam.

A process for producing a polyisocyanurate foam comprising the steps of:

• I. continuously admixing at one point from separate sources:
• A. an organic polyisocyanate
• B. a diol having an equivalent weight of 30 to 100,
• C. a catalytic composition comprising
• 1. an alkali metal carboxylate which is a saturated aliphatic mono-carboxylic acid salt of an alkali metal,
• 2. a compound of Formula IV:
• HO--CH.sub.2 CH.sub.2 O.sub.n H IV
• wherein n is an integer from 3 to 10 inclusive, to form a mixture comprising A, B and C,
• wherein the equivalent ratio of A:B has a specific value between 2:1 and 6:1,
• wherein the amount of catalytic composition is varied independently of the ratio A:B such that the catalytic composition comprises from 0.01 to 5 weight percent of the polyisocyanurate foam, and then,
• Ii. continuously applying the mixture comprising A, B and C to a moving substrate, and then
• Iii. recovering the polyisocyanurate foam adhering to the substrate.