# US 5,349,002 A · Heat curable primerless silicone hardcoat compositions, and thermoplastic composites

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- Number: US 5,349,002 A
- Document ID: US5349002A
- Status: Granted
- Kind: A
- Application number: 07/984,612
- Filed: 1992-12-02
- Granted: 1994-09-20
- Earliest claimed: 1992-12-02
- Assignees: General Electric Company
- Inventors: Gautam A. Patel
- Web page: https://patentgrep.com/patent/US5349002A

## CPC

- C09D 183/04: Polysiloxanes
- C08J 7/0427: {with only one layer of a composition containing a polymer binder (with more layers C08J7/042)}
- C08J 7/043: Improving the adhesiveness of the coatings per se, e.g. forming primers (adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50)
- C08J 7/046: Forming abrasion-resistant coatings; Forming surface-hardening coatings
- C08J 2483/00: Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- Y10T 428/31507: Of polycarbonate
- Y10T 428/31663: As siloxane, silicone or silane
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A primerless silicone hardcoat composition is provided which utilizes polycaprolactone polyol as an adhesion promoter in combination with silicone hardcoat ingredients,

## Claims

### Claim 1

A heat curable primerless silicone hardcoat composition comprising by weight,
(A) 100 parts of an aqueous/organic solvent dispersion having 10-50% by weight of solids and consisting essentially of 10-70% by weight of colloidal silica and 30-90% by weight of a partial condensate of an organoalkoxysilane, and
(B) 1 to 10 parts of an adhesion promoter consisting essentially of a caprolactone based polyester polyol.

### Claim 2 (depends on 1)

A heat curable primerless silicone hardcoat composition in accordance with claim 1, where the organoalkoxysilane is methyltrimethoxysilane.

### Claim 3 (depends on 1)

A heat curable primerless silicone hardcoat composition in accordance with claim 1 where the adhesion promoter is a polycaprolactone diol.

### Claim 4 (depends on 1)

A heat curable primerless silicone hardcoat composition in accordance with claim 1, where the adhesion promoter is a polycaprolactone triol.

### Claim 5

A composite of a thermoplastic sheet having a cured coating resulting from the thermal cure of a heat curable primerless silicone hardcoat composition comprising by weight,
(A) 100 parts of an aqueous/organic solvent dispersion having 10.varies.50% by weight of solids and consisting essentially of 10-70% by weight of colloidal silica and 30-90% by weight of a partial condensate of an organoalkoxysilane, and
(B) 1 to 10 parts of an adhesion promoter consisting essentially of a caprolactone based polyester polyol.

### Claim 6 (depends on 5)

A composite in accordance with claim 5, where the thermoplastic sheet is a polycarbonate.