Polyurethane foams

Claim 2

A PROCESS FOR THE PRODUCTION OF A ONE-SHORT FLEXIBLE FLAMERATARDANT POLYURETHANE FOAM WHICH COMPRISES REACTING TOGETHER IN A FOAM-FORMING REACTION MIXTURE: A. A POLYMERIC POLYOL, B. AN AROMATIC POLYISOCYANATE C. AS A FOAM MODIFIER A SUBSTANCE NORMALLY EFFECTIVE AS A CATALYST FOR THE POLYMERIZATION OF TOYLENE DISSOCYANATE SELECTED FROM THE GROUP CONSISTING OF AN ALKALI METAL SALT OF A WEAK ORGAIC ACID AND AN ALKALI METAL SALT OF A WEAK INORGANIC ACID AND D. AS AN ADDITIVE TO PREVENT THE DELETERIOUS EFFECT OF SAID FOAM MODIFIER ON AGEING OF THE FOAM, A SUBSTANCE WHICH RELEASES AN ALIPHATIC OR AROMATIC SULPHONIC ACID UNDER THE CONDITIONS OF SAID FOAM-FORMING REACTION.

Claim 3

A process as claimed in claim 1, in which said additive d) is a derivative of an aromatic sulphonic acid.

Claim 4

A process as claimed in claim 1 in which said additive (d) is an ester of a sulphonic acid and an aliphatic alcohol having 1 to 6 carbon atoms.

Claim 5

A process as claimed in claim 3, in which said additive d) is a cyclic ester of a sulphonic acid.

Claim 6

A process as claimed in claim 4, in which said cyclic ester is a sultone.

Claim 7

A process as claimed in claim 5, in which said sultone is 1,3 propane sultone.

Claim 8

A process as claimed in claim 1, in which said foam modifier is an alkali metal salt of a weak inorganic acid.

Claim 9

A process as claimed in claim 7, in which said foam modifier is sodium carbonate.

Claim 10

A process as claimed in claim 1, in which said foam modifier is an alkali metal salt of a weak organic acid.

Claim 11

A process as claimed in claim 9, in which said foam modifier is sodium acetate or potassium acetate.

Claim 12

A process as claimed in claim 1, in which said foam modifier is present in the foam-forming reaction mixture in an amount of from 0.05 to 1% by weight of said polymeric polyol.

Claim 13

A process as claimed in claim 1, in which said sulphonic acid additive d) is present in the foam-forming reaction mixture in an amount of from 0.5 to 4% by weight of said polymeric polyol.

Claim 14

A one-shot flexible flame-resistant polyurethane foam produced by reacting together in a foam-forming reaction mixture a polymeric polyol and an aromatic polyisocyanate wherein said foam-forming reaction mixture contains: a. as a foam modifier, from 0.05 to 1 per cent by weight of polymeric polyol of a substance normally effective for polymerization of tolylene diisocyanate and selected from the group consisting of an alkali metal salt of a weak organic acid and an alkali metal salt of a weak inorganic acid and b. as an anti-ageing additive for the foam from 0.5 to 4 per cent by weight of polymeric polyol of a substance which releases an aliphatic or aromatic sulphonic acid under the conditions of said foam-forming reaction.

Claim 15

A one-shot flexible flame-resistant polyurethane foam produced by reacting together in a foam-forming reaction mixture a polymeric polyol and an aromatic polyisocyanate wherein said foam-forming reaction mixture contains: a. as a foam modifier, from 0.05 to 1 per cent by weight of polymeric polyol of a substance normally effective for polymerization of tolylene diisocyanate and selected from the group consisting of an alkali metal salt of a weak organic acid and an alkali metal salt of a weak inorganic acid and b. as an anti-ageing additive for the foam from 0.5 to 4 per cent by weight of polymeric polyol of a substance which releases an aliphatic or aromatic sulphonic acid under the conditions of said foam-forming reaction.