Mold release agent for duroplastic molded parts
AssigneeABB Research Ltd.
InventorUwe Kaltenborn
Life of this patent
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Abstract
Mold-release agent for producing thermoset moldings with a hydrophobicized surface, where the agent comproses (I) at least one compound with mold-release action, and also (ii) at least one reactive, where appropriate hydrolyzable, silane compound, which is capable of reacting chemically in situ with the thermoset surface which forms during the molding process. The use of a mold-release agent of this type in a molding process and/or in a post-curing process for the production of thermoset moldings with a hydrophobicized surface, and also the moldings produced in this way.
Claims22
A mold-release composition for the production of thermoset moldings with a hydrophobicized surface, comprising:
- (i) at least one polydimethylsiloxane with mold-release action of the general formula (I):
- (CH3)3Si—O—[Si(CH3)2—O]m—Si(CH3)3 (I),
- where m is 0 or an integer from 1 to 1000;
- and
- (ii) at least one reactive, optionally hydrolyzable, silane compound, which is capable of reacting chemically in situ with the thermoset surface which forms during the molding process, the reactive silane compound corresponding to the general formula (III):
- (CH3O)3-p(CH3)pSi—[O—Si(CH3)2]s—R (III),
- where:
- p is 0, 1, 2 or 3,
- s is 0 or an integer from 1 to 100,
- R is a monovalent, unsubstituted or hydroxyl-substituted, organic radical, which includes at least one reactive group capable of reacting chemically with an epoxy resin, and the proportion of the reactive silane of component (ii) is in the range from 5 per thousand by weight to 5% by weight based on the total weight of components (i) and (ii).
The mold-release composition as claimed in 5, wherein r is 1, 2 or 3.
A mold-release composition for the production of thermoset moldings with a hydrophobicized surface, comprising:
- (i) at least one polydimethylsiloxane with mold-release action of the general formula (I):
- (CH3)3Si—O—[Si(CH3)2—O]m—Si(CH3)3 (I),
- where m is 0 or an integer from 1 to 1000;
- and
- (ii) at least one reactive, optionally hydrolyzable, silane compound which is capable of reacting chemically in situ with the thermoset surface which forms during the molding process, wherein the proportion of the reactive silane compound of component (ii) is in the range from 5 per thousand by weight to 5% by weight, based on the total weight of components (i) and (ii).
A mold-release composition for the production of thermoset moldings with a hydrophobicized surface, comprising:
- (i) at least one polydimethylsiloxane with mold-release action;
- and
- (ii) at least one reactive, optionally hydrolyzable, silane compound which is capable of reacting chemically in situ with the thermoset surface which forms during the molding process, the proportion of the reactive silane compound of component (ii) is in the range from 5 per thousand by weight to 5% by weight, based on the total weight of components (i) and (ii);
- wherein the reactive silane compound is at least one of acetoxy-methyltrimethoxysilane, acetoxypronpyltrimethoxy-silane, hydroxymethyltriethoxysilane, hydroxy-methyltrimethylsilane, and isocyanatopropyl-triethoxysilane.
Dependencies are inferred from the claim text.