US 2003/0194571 A1 · Hard coating composition and resin product with hard coat

Abstract

A resin substrate having a hard coat formed from a hard coat composition which comprises colloidal silica, a silicon compound having a fluoroalkyl group and optionally an ultraviolet light absorbing organic group. This resin substrate can retain water-repellency even when it is used in the open air and prevent the adhesion of a stain while it keeps its abrasion resistance for a long time by the hard coat composition.

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Drawings

Claims8

Dependent claims

A hard coat composition comprising:

colloidal silica;
a compound represented by the following formula (1):
R1aR2bSi(OR3)4−a−b (1)
wherein R1 is an alkyl group having 1 to 4 carbon atoms, chloroalkyl group having 1 to 4 carbon atoms, aryl group having 6 to 12 carbon atoms, haloaryl group having 6 to 12 carbon atoms, methacryloxyalkyl group having 5 to 8 carbon atoms, ureidoalkylene group having 2 to 10 carbon atoms, aromatic ureidoalkylene group having 8 to 24 carbon atoms, aromatic alkylene group having 8 to 24 carbon atoms or mercaptoalkylene group having 1 to 12 carbon atoms, R2 is an alkyl group having 1 to 6 carbon atoms, aryl group having 6 to 12 carbon atoms, alkenyl group having 2 to 10 carbon atoms, chloroalkyl group having 1 to 4 carbon atoms or haloaryl group having 6 to 12 carbon atoms, R3 is a hydrogen atom, alkyl group having 1 to 4 carbon atoms, acyl group having 1 to 6 carbon atoms or alkylacyl group having 3 to 12 carbon atoms, a is 1, 2 or 3, and b is 0, 1 or 2, with the proviso that (a+b) is 1, 2 or 3;
and
a compound represented by the following formula (2):
R4cR5dSi(OR6)4−c−d (2)
wherein R4 is a fluoroalkyl group having 1 to 12 carbon atoms, R5is alkyl group having 1 to 6 carbon atoms, aryl group having 6 to 12 carbon atoms, alkenyl group having 2 to 10 carbon atoms, haloalkyl group having 1 to 6 carbon atoms or haloaryl group having 6 to 12 carbon atoms, R6 is a hydrogen atom, alkyl group having 1 to 4 carbon atoms, acyl group having 1 to 6 carbon atoms or alkylacyl group having 3 to 12 carbon atoms, c is 1, 2 or 3, and d is 0, 1 or 2, with the proviso that (c+d) is 1, 2 or 3.

5 more elements

Dependencies are inferred from the claim text.

Description4,141 words

Summary3,312 words

#The present invention relates to a hard coat composition and a resin product having a hard coat therefrom. More specifically, it relates to a hard coat composition which provides a hard coat having weatherability, abrasion resistance and water repellency and to a resin product having this hard coat.

#It has been known that a coating film of an acrylic composition comprising a polyfunctional acryl as the main component or a silicon-based composition comprising a polysiloxane as the main component is formed on the surface of a resin substrate to obtain a resin product having a water-repellent surface.

#However, a coating film comprising an organic resin as a binder cannot retain sufficient water-repellency after exposure to ultraviolet radiation and is not satisfactory in terms of abrasion resistance. Further, a coating film made from only a silicon-based composition cannot avoid reductions in light transmission and brightness because a water drop containing a contaminant is readily adhered to the surface of the film when it is used in the open air. Further, water-repellency is maintained for only a few months when it is used in the open air.

Detailed description829 words

#The following examples are provided to further illustrate the present invention. Substances used in the examples are as follows.

#Polycarbonate board: board of Panlite PC1111 (Teijin Chemicals, Ltd.) having a thickness of 4 mm.

#Primer 1: solution containing 100 g of a copolymer of methyl methacrylate and methacryloxypropyltrimethoxysilane in a molar ratio of 4:1 (Mn=10,000, Mw=40,000), 50 g of 2,4-dihydroxybenzophenone, 850 g of propylene glycol monomethyl ether and 0.1 g of Paint Additive 31 of Dow Corning Co., Ltd.

Facts

Application

10/311,252Filed 13 Dec 2002

Published

16 Oct 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

C09D 183/08
Polysiloxanes: containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
C08K 3/36
Silicon-containing compounds: silica
Y10T 428/31663
Of asbestos: as siloxane, silicone or silane
C09D
Coating compositions

Hard coating composition and resin product with hard coat

Life of this patent

Hard coating composition and resin product with hard coat

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims8

Description4,141 words

Drawings

Classification6 codes

Life of this patent

Description4,141 words