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US 7,462,668 B2Granted
Low VOC-solvent based mold release agent and curable mold release compositions based thereon
AssigneeHenkel Corporation
InventorsZheng Lu, Randy Lee Smith, Tamara Lynn Harmar, Daniel I. Shaw
Life of this patent
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Abstract
The present invention relates to curable mold release compositions containing a non-volatile organic (non-VOC), or low-volatile organic (low-VOC), component employed as a carrier for a curable component. When applied as a coating the mold release compositions cure to a finish having a high durability that is sustained throughout multiple releases.
Claims4
A curable mold release composition comprising:
- a) a carrier composition comprising a compound selected from the group consisting of branched, linear, or cyclic siloxanes having 2-6 silicon atoms;
- and b) a curable composition comprising an amino-functional silazane and a polyfunctional siloxane, wherein said carrier is present in amounts of about 90% to about 99.8% by weight of the total composition.
A curable mold release composition comprising:
- a) a non-volatile organic (non-VOC) carrier composition selected from the group consisting of branched, linear or cyclic siloxanes having 2-6 silicone atoms;
- branched, linear or cyclic fluorinated alkanes;
- and combinations thereof and
- b) a curable component comprising a combination of at least one cross-linker selected from the group consisting of a cyclic silazane;
- an amino-functional silane;
- a tris enoxy functional silane;
- and combinations thereof;
- and
- c) a polyfunctional siloxane of the formula:
- wherein R1, R2, R3, R1, R5, and R6 are the same or different and can be alkyl, aromatic hydrocarbon, organoamine, fluorinated hydrocarbon, organo-alkoxy, hydro, organo-mercapto, organo-chloro, organo-cyano, or allyl;
- P1 and P2 are the same or different and can be hydroxyl, hydro, or alkoxy;
- and n is 0 to 100,000;
- wherein said mold release composition when applied as a coating cures to a durability which permits at least five releases without transfer of mold release composition to a part.
10 more elements
Dependencies are inferred from the claim text.