Release agent composition

DETAILED DESCRIPTION OF THE INVENTION The objectives of this invention are achieved by release agent composition comprising a mixture of (A) an amino-functional diorganopolysiloxane that contains no more than 50,000 ppm Si.
sub.
.
ltoreq.
20 dimethylsiloxane oligomer and (B) an amine-free dimethylpolysiloxane that contains no more than 500 ppm Si.
sub.
.
ltoreq.
20 dimethylsiloxane oligomer, wherein said composition has an amine equivalent weight of from 1,000 to 150,000, a Si.
sub.
.
ltoreq.
20 dimethylsiloxane oligomer content not exceeding 5,000 ppm, and a viscosity of 50 to 30,000 centistokes at 25.
degree.
C.
The amino-functional diorganopolysiloxane, referred to hereinafter as ingredient A, forms the basis of the present release agents and can be represented by the general formula ##STR1## In this formula R.
sup.
1 represents a monovalent hydrocarbon radical, and is exemplified by but not limited to C.
sub.
1 to C.
sub.
20 monovalent hydrocarbon radicals such as methyl, ethyl, propyl, butyl, pentyl, vinyl, 3,3,3-trifluoropropyl, and phenyl.
The R.
sup.
1 groups in a molecule need not all be identical.
R.
sup.
1 is most typically methyl, however combinations of methyl with other hydrocarbon radicals is also typically used for R.
sup.
1.
Preferably at least one of the R.
sup.
1 substituents on each silicon atom is methyl.
R.
sup.
2 represents the hydrogen atom or a monovalent hydrocarbon radical that is exemplified by but not limited to methyl, ethyl, propyl, phenyl, and cyclohexyl.
The group represented by A is a monovalent hydrocarbon radical as defined for R.
sup.
1 or an organic group with the formula ##STR2## where a is an integer with a value of zero to 10 and it is generally zero or 1 and Q represents a divalent hydrocarbon radical, and it is exemplified by but not limited to alkylene such as ##STR3## and alkarylene such as --(CH.
sub.
2).
sub.
2 C.
sub.
6 H.
sub.
4 --.
Q is most preferably propylene, m and n are both integers with values of at least 1, and the sum m+n is equivalent to a viscosity at 25.
degree.
C