CO.sub.2 blown integral skin foams
AssigneeImperial Chemical Industries PLC
InventorsAlain Parfondry, Jan W. Leenslag
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Abstract
A process for making integral skin foams which comprises reacting into a closed mould: A) an organic polyisocyanate B) an isocyanate-reactive composition comprising: (i) a catalytically effective amount of a urethane-promoting catalyst and optionally a urea-promoting catalyst, (ii) a catalytically effective amount of a carbodiimide-promoting catalyst, and (iii) an isocyanate-reactive compound; in the presence of C) an inert physical blowing agent. The process provides integral skin foams having good skin properties at reduced physical blowing agent levels.
Claims13
A process for making integral skin foams with a reduced amount of chlorofluorocarbon blowing agent, which comprises reacting in a closed mould:
- A) an organic polyisocyanate
- B) an isocyanate-reactive composition comprising:
- (i) a catalytically effective amount of a urethane-promoting catalyst and optionally a urea-promoting catalyst,
- (ii) a catalytically effective amount of a carbodiimide-promoting catalyst of the formula ##STR6## wherein R.sup.1 is a substituted or unsubstituted hydrocarbyl group, one of R.sup.2 and R.sup.4 is Cl or alkyl of 1 to 12 C, while the other forms a double bond with R.sup.3, and R.sup.5 to R.sup.9 are H, Cl or alkyl of 1 to 12 C, and
- (iii) an isocyanate-reactive compound;
- in the presence of
- C) an inert physical blowing agent with the proviso that the amount of chlorofluorocarbons is between 3 and 10% by weight of total isocyante-reactive composition.
A process according to claim wherein the amount of physical blowing agent ranges from 3% to 15% by weight of total isocyanate-reactive composition.
A reaction system for use in the preparation of moulded integral skin foams which system comprises:
- A) an organic polyisocyanate
- B) an isocyanate-reactive composition comprising:
- (i) a catalytically effective amount of a urethane-promoting catalyst and optionally a urea-promoting catalyst,
- (ii) a catalytically effective amount of a carbodiimide-promoting catalyst of the formula ##STR7## wherein R.sup.1 is a substituted or unsubstituted hydrocarbyl group, one of R.sup.2 and R.sup.4 is Cl or alkyl of 1 to 12 C, while the other forms a double bond with R.sup.3, and R.sup.5 to R.sup.9 are H, Cl or alkyl of 1 to 12 C, and
- (iii) an isocyanate-reactive compound;
- and
- C) an inert physical blowing agent with the proviso that the amount of chlorofluorocarbons is between 3 and 10% by weight of total isocyanate-reactive composition.
An isocyanate-reactive composition for use in the preparation of moulded integral kin foams which system comprises:
- (i) a catalytically effective amount of a urethane-promoting catalyst and optionally a urea-promoting catalyst,
- (ii) a catalytically effective amount of a carbodiimide-promoting catalyst of the formula ##STR8## wherein R.sup.1 is a substituted or unsubstituted hydrocarbyl group, one of R.sup.2 and R.sup.4 is Cl or alkyl of 1 to 12 C, while the other forms a double bond with R.sup.3, and R.sup.5 to R.sup.9 are H, Cl or alkyl of 1 to 12 C, and
- (iii) an isocyanate-reactive compound;
- and an inert physical blowing agent in a range of 3% to 15% by weight of isocyanate-reactive composition with the proviso that the amount of chlorofluorocarbon is between 3 and 10% by weight of total isocyanate-reactive composition.
A process for making integral skin foams with a reduced amount of chlorofluorocarbon blowing agent, which comprises reacting in a closed mould:
- A) an organic polyisocyanate
- B) an isocyanate-reactive composition comprising:
- (i) a catalytically effective amount of a urethane-promoting catalyst and optionally a urea-promoting catalyst,
- (ii) a catalytically effective amount of a carbodiimide-promoting catalyst, and
- (iii) an isocyanate-reactive compound;
- in the presence of
- C) an inert physical blowing agent wherein the amount of urethane-promoting catalyst is of at most 5% by weight of total isocyanate-reactive composition and wherein the amount of carbodiimide-promoting catalyst is of at most 5% by weight of total isocyanate-reactive composition.
A process for making integral skin foams with a reduced amount of chlorofluorocarbon blowing agent, which comprises reacting in a closed mould:
- A) an organic polyisocyanate
- B) an isocyanate-reactive composition comprising:
- (i) a catalytically effective amount of a urethane-promoting catalyst and optionally a urea-promoting catalyst,
- (ii) a catalytically effective amount of a carbodiimide-promoting catalyst, and
- (iii) an isocyanate-reactive compound;
- in the presence of
- C) an inert physical blowing agent with the proviso that the amount of chlorofluorocarbons is between 3 and 10% by weight of total isocyanate-reactive composition.
Dependencies are inferred from the claim text.