Claims
- 1. An internal mould release composition comprising:
- (a) a metal salt of a carboxylic acid having 8-24 carbon atoms, said metal being selected from lithium, magnesium, calcium, barium, iron, cobalt, nickel, aluminum, copper, cadmium and zinc, and
- (b) a polysiloxane polymer having organic groups which are reactive with isocyanate groups in a weight ratio between about 1:9 and 9:1 polysiloxane polymer to metal salt.
- 2. The composition according to claim 1 wherein said polysiloxane polymer comprises 0.5-20 mol percent of R.sub.a R'.sub.b SiO.sub.[b 4 -(a+b)]/2 units and 80-99.5 mol percent of R".sub.c SiO.sub.( 4c) /2 units where R is an isocyanate reactive organic radical, (a) has an average value of from 1-3, R' and R" are both nonisocyanate reactive organic hydrocarbon radicals or non-isocyanate reactive substituted organic radicals, (b) has an average value of 0-2, a+b is from 1-3 , and (c) has an average value of from 1-3, wherein
- the ratio of the total molecular weight of said polysiloxane polymer to the total number of isocyanate reactive functional groups in said polysiloxane polymer ranges from 100-3500,
- the combined formula weights of all isocyanate reactive organic radicals, R, do not exceed 40% of the total molecular weight of said polysiloxane polymer,
- the combined formula weights of all non-isocyanate reactive radicals, R'+R" together do not exceed 40% of the total molecular weight of said polysiloxane polymer,
- the combined formula weights of all the organic radicals R +R'+R" in the polymer together do not exceed 60% of the total molecular weight of the polymer, said
- polysiloxane polymer contains an average of at least two isocyanate-reactive functional groups per molecule,
- at least two of the isocyanate reactive functional groups in each molecule are located on separate organic radicals, R, attached independently to different silicon atoms in said polysiloxane molecule,
- said isocyanate reactive functional groups (R) are selected from the group consisting of alcohols, phenols, thiols, primary or secondary amines, imines, enamines, and ketene aminals;
- said polysiloxane polymer being substantially insoluble in liquid polyisocyanates.
- 3. A composition of claim 1 wherein said polysiloxane has a molecular weight of 4000-8000 and a viscosity of 1-100,000 mm.sup.2 /s.
- 4. The composition of claim 2 wherein R is selected from the group consisting of R'"-OH,
- R'"--CHOHCH.sub.2 OH, R'"--CHOHCH.sub.3, R'"--SH, R'"--CH.sub.2 SH; ##STR8## is a divalent linking group composed of carbon and hydrogen; carbon, hydrogen and oxygen; carbon, hydrogen and sulfur; carbon, hydrogen and nitrogen; or carbon, hydrogen, oxygen and nitrogen.
- 5. A composition according to claim 1 wherein said metal salt is zinc stearate.
- 6. An internal mould release composition comprising:
- (a) a metal salt of a carboxylic acid having 8-24 carbon atoms, said metal being selected from lithium, magnesium, calcium, barium, iron, cobalt, nickel, aluminum, copper, cadmium and zinc, and
- (b) a polysiloxane polymer having organic groups which are reactive with isocyanate groups in a weight ratio between about 1:4 and 4:1 polysiloxane polymer to metal salt.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9021524 |
Oct 1990 |
GBX |
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Parent Case Info
This is a continuation of application Ser. No. 07/769,191, filed on Sep. 16,1991, now abandoned.
US Referenced Citations (6)
Continuations (1)
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Number |
Date |
Country |
Parent |
760191 |
Sep 1991 |
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