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Heat curable compositions for tintable abrasion resistant transparent hard-coatings

A composition, thermosetting technology, applied in the direction of coating, thin material handling, transportation and packaging, which can solve the problem of ISTMBayer not exceeding the wear resistance and so on.

Active Publication Date: 2012-12-05
ESSILOR INT CIE GEN DOPTIQUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] While the coating compositions described in these prior art documents, such as the product TC332 sold by SDC, have quite satisfactory pigmentation properties, unfortunately their ISTM Bayer abrasion resistance does not exceed about 1-1.3

Method used

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  • Heat curable compositions for tintable abrasion resistant transparent hard-coatings
  • Heat curable compositions for tintable abrasion resistant transparent hard-coatings
  • Heat curable compositions for tintable abrasion resistant transparent hard-coatings

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Experimental program
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Embodiment Construction

[0052] Preparation of Curable Coating Compositions

[0053] Formulation A and Formulation B of the present invention were prepared as follows (see Table 1 below):

[0054] - weighing gamma-glycidoxypropyltriethoxysilane (GLYMO) in the bottle,

[0055] - adding an aqueous solution of HCl (0.1N) dropwise with stirring, and stirring the resulting mixture at room temperature for about 30 minutes to hydrolyze,

[0056] - dropwise addition of dimethyldiethoxysilane (DMDES) followed by the coloring additive of formula (Ib) obtained by capping PTHF with a molecular weight of 250 with 3-isocyanatopropyltriethoxysilane (IPTEOS) ,

[0057] - adding a 30% by weight suspension of colloidal silicon dioxide in methanol and stirring the mixture for about 10 minutes,

[0058] - After addition of fluorinated surfactant (FC430, 3M Specialty Chemicals) and curing catalyst (aluminum acetylacetonate) dissolved in methyl ethyl ketone, the mixture was stirred for 24 hours.

[0059] - Cool the fi...

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Abstract

The present invention is relative to a heat-curable coating composition forming transparent tintable abrasion-resistant coatings, said compositions comprising, in an aqueous or hydro-organic solvent: (A) a hydrolysate of an epoxy-functional silane compound containing at least two alkoxy groups, (B) colloidal silica having an average particle diameter of 1 to 100 [mu]m, (C) an aluminium chelate compound of formula A1(O-C1-4alkyl)nY3-n wherein n is 0, 1 or 2 and Y is a ligand selected from the group consisting of M-C(=O)-CH2-C(=O)-M and M-C(=O)-CH2-C(=O)O-M, wheren each M is independently a C1-4 alkyl group, and (D) a hydrolysate of a silylated poly(tetrahydrofurane) of formula (Ia) or (lb) said heat-curable composition not containing any multifunctional cross-linking agents selected from the group consisting of multifunctional carboxylic acids and multifunctional anhydrides.

Description

technical field [0001] The present invention relates to silane-based thermosetting coating compositions, to the transparent, colorable hardcoats thus obtained, and to optical articles, in particular spectacle lenses, comprising such hardcoats. Background technique [0002] Spectacle lenses of transparent organic material (plexiglass) are lighter and less brittle than inorganic glass and are currently widely used. A major problem with plexiglass is its rather low scratch and abrasion resistance. Therefore, coatings made of thermoplastic polymers or thermosetting coatings are usually protected by applying a thermosetting or light-curing coating composition, for example based on alkoxysilane and silica, and polymerizing the alkoxysilane in the presence of a suitable catalyst. Spectacle lenses made of polymers. [0003] When such plexiglass is made of a non-colorable material such as thermoplastic polycarbonate, the hard coat should be further rendered easy to color by immersi...

Claims

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Application Information

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IPC IPC(8): C09D183/04C09D201/10
CPCC08K3/36C09D183/06C09D201/10C08K5/05C09D183/14Y10T428/265
Inventor 宋立新P·W·张
Owner ESSILOR INT CIE GEN DOPTIQUE