Method for producing coated non-crosslinking polymer materials
AssigneeBASF Coatings GmbH
InventorsKarin REUTER, Florian GUTSCHE, Simon WINZEN
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Abstract
Described herein is a process for producing molded non-crosslinked polymer materials including at least one at least partially coated surface, where a coating composition having release agent properties is used to coat the non-crosslinking polymer material. The coated materials show good optical properties as well as a good mechanical stability as well as a high flexibility. Further described herein are molded non-crosslinked polymer materials including at least one at least partially coated surface, which are produced by the process.
Claims20
A process for producing molded non-crosslinked polymer materials comprising at least one at least partially coated surface, said process comprising the following steps in the stated order:
- (a) providing a closable, three-dimensional mold (MO) having at least two mold parts which are movable relative to each other and which form a mold cavity with at least two inner surfaces (SU),
- (b) applying a coating composition (C1) on at least a part of at least one inner surface (SU) and drying the applied coating composition (C1);
- (c) optionally inserting at least one material (M1) into the mold (MO) and heating the mold (MO);
- (d) closing the mold (MO) and injecting a non-crosslinkable polymer composition (C2) into the closed mold (MO) or introducing a non-crosslinkable polymer composition (C2) into the open mold (MO) and closing said mold (MO);
- (e-1) heating the mold (MO) to expand the non-crosslinkable polymer composition (C2) and optionally fuse the expanded non-crosslinkable polymer composition while at least partially curing the coating composition (C1), or (e-2) heating the mold (MO) to fuse the non-crosslinkable polymer composition (C2) while at least partially curing the coating composition (C1);
- or
- (e-3) harden the non-crosslinkable polymer composition (C2) while at least partially curing the coating composition (C1);
- (f) opening of the mold (MO) and removing the molded non-crosslinked polymer material comprising at least one at least partially coated surface;
- (g) optionally post-treating of the material obtained after step (f),
- wherein the coating composition (C1) comprises
- (i) at least one solvent L;
- (ii) at least one compound of the general formula (I)
- in which R1 is a saturated or unsaturated aliphatic hydrocarbon radical having 6 to 30 carbon atoms,
- R2 is H,
- AO stands for one or more alkylene oxide radicals selected from the group consisting of ethylene oxide, propylene oxide and butylene oxide,
- r is 0 or 1, and
- s is 0 to 30;
- (iii) at least one polysiloxane of the general formula (II)
- in which
- R3 and R4, in each case independently of one another, are a methyl group or a (HO—CH2)2—C(CH2—CH3)—CH2—O—(CH2)3—* radical,
- R5 is a methyl group,
- a is 0 or 1 to 10, and
- b is 3 to 30;
- (iv) at least one binder;
- (v) at least one crosslinking agent;
- and
- (vi) optionally at least one polyether-modified alkylpolysiloxane.
Dependencies are inferred from the claim text.