Non-stick coated molds
AssigneeGE Bayer Silicones GmbH & Co. KG
InventorsGerhard Heilig, Thomas Gross, Helmut Steinberger
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Abstract
The invention provides non-stick coated molds, a process for the preparation thereof and their use for the production of plastics molded parts, particularly for the production of molded parts made of polyurethane foam.
Claims9
A mold having a non-stick coating wherein the non-stick coating comprises organomodified nanoscale SiO2 particles.
A process for the production of a mold having a non-stick coating, comprising
- (1) applying a coating to the internal surface(s) of a metal or plastic mold, wherein the coating comprises the reaction product of:
- a) one or more colloidal silicon dioxide solutions having an average particle size of 5 to 150 nanometers diameter,
- b) one or more organofunctional trialkoxysilanes corresponding to the general formula:
- R′—Si(OR)3
- wherein:
- R′:
- represents an optionally fluorinated alkyl substituent having 1 to 6 carbon atoms, a vinyl substituent, an acryloyl substituent, a methacryloyl substituent, a γ-glycidoxypropyl substituent, or a γ-methacryloxypropyl substituent, and
- each R:
- may be the same or different and represents an alkyl substituent having 1 to 8 carbon atoms,
- c) one or more pH regulating additives
- and, optionally,
- d) a catalyst;
- and
- (2) curing the coating of step (1).
In a process for the production of a plastic molded part, comprising filling a mold with a reaction mixture suitable to form a plastic part, allowing the plastic part to cure and removing the plastic part from the mold, the improvement wherein the mold has a non-stick coating which comprises organomodified nanoscale SiO2 particles.
Dependencies are inferred from the claim text.