Internal mold release compositions
OwnerTrent A. Shidaker, David W. Bareisinventors
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Abstract
Internal mold release systems that include an internal mold release agent that includes any one of fatty acids, fatty acid esters and metal carboxylates, and employ a poly(dimethylsiloxane) surfactant with the following formula: (CH3)3Si—O—[(CH3)2Si—O—]n—[CH3—Si(R)—O—]m—Si(CH3)3 wherein, R=—(CH2)3—O—[EO]x—R′; R′ is H; C1 to C20 alkyl; or C6 to C25 aryl; x is a number from greater than 1 up to about 24; m is a number from 1 to about 25; and n is a number from 0 to about 100. Isocyanate compositions, isocyanate reactive compositions and polyurethane reaction systems that employ the surfactant also are disclosed.
Claims16
A reaction system for producing a polymer comprising:
- a) a polyisocyanate composition;
- b) a polyfunctional isocyanate reactive composition;
- c) an internal mold release composition, said internal mold release composition containing:
- i) a fatty polyester, and
- ii) a fatty acid which is different from the fatty polyester;
- d) a poly(dimethylsiloxane)-polyoxyethylene surfactant;
- and optionally
- e) a catalyst suitable for promoting a polymer-forming reaction between the polyisocyanate composition and the polyfunctional isocyanate reactive composition;
- wherein the polyisocyanate composition and the polyfunctional isocyanate reactive composition are present in proportions suitable for the formation of a polymer;
- and
- wherein the poly(dimethylsiloxane)-polyoxyethylene surfactant is essentially free of oxyalkylene units derived from alkylene oxides other than ethylene oxide and is present in the reaction system in an amount such that the poly(dimethylsiloxane)-polyoxyethylene surfactant contributes more than 0.006 moles of EO per 100 g of the polymer derived from the reaction system.
Dependencies are inferred from the claim text.