Filled arcylate and methacrylate films
First Claim
1. A free standing, optically clear, film having a thickness of about 1 to about 500 microns, said film consisting essentially of a poly(acrylate) or poly(methacrylate) polymer, having substantially uniformly dispersed therein, particles of an in situ produced, silicon oxide, said particles having a size less than about 0.1 micron;
- the concentration of said particles in said film being in the range of from about 10 to about 65 weight percent based on the weight of the polymer;
said film being further characterized by having no designed covalent linkage between said silicon oxide and said polymer;
said film having been derived by a process comprising (a) hydrolyzing and condensing a tetra(lower alkyl)orthosilicate (i) in the substantial absence of a polymerizable substance other than said silicate, (ii) using acidic hydrolysis, (iii) and using a stoichiometric or substantially stoichiometric amount of water for hydrolysis, (iv) and in an organic solution of said polymer, the solvent in said solution having a relatively low boiling point, a fairly high volatility, and being substantially inert and miscible with water; and
(b) subsequently coating the composition thereby produced on a heated non-sticking surface having a temperature of about 30°
to about 35°
C.;
(c) drying and curing the coat on said surface to produce said film; and
(d) subsequently removing said film from said surface.
1 Assignment
0 Petitions
Accused Products
Abstract
Free standing, optically clear, poly(acrylate) or poly(methacrylate) film having dispersed therein silica which is produced in situ from an alkoxysilane, using acid catalysis and a substantially stoichiometric amount of water for hydrolysis. The film forming process comprises a drying and curing step conducted in an open system. The temperatures and pH employed determine the nature and morphology of the dispersed silica phase. The film-forming process is conducted in the substantial absence of a polymerizable substance other than the alkoxysilane.
26 Citations
9 Claims
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1. A free standing, optically clear, film having a thickness of about 1 to about 500 microns, said film consisting essentially of a poly(acrylate) or poly(methacrylate) polymer, having substantially uniformly dispersed therein, particles of an in situ produced, silicon oxide, said particles having a size less than about 0.1 micron;
- the concentration of said particles in said film being in the range of from about 10 to about 65 weight percent based on the weight of the polymer;
said film being further characterized by having no designed covalent linkage between said silicon oxide and said polymer;said film having been derived by a process comprising (a) hydrolyzing and condensing a tetra(lower alkyl)orthosilicate (i) in the substantial absence of a polymerizable substance other than said silicate, (ii) using acidic hydrolysis, (iii) and using a stoichiometric or substantially stoichiometric amount of water for hydrolysis, (iv) and in an organic solution of said polymer, the solvent in said solution having a relatively low boiling point, a fairly high volatility, and being substantially inert and miscible with water; and
(b) subsequently coating the composition thereby produced on a heated non-sticking surface having a temperature of about 30°
to about 35°
C.;
(c) drying and curing the coat on said surface to produce said film; and
(d) subsequently removing said film from said surface. - View Dependent Claims (2, 3)
- the concentration of said particles in said film being in the range of from about 10 to about 65 weight percent based on the weight of the polymer;
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4. Process for the preparation of an optically clear, free standing film, said process comprising (a) hydrolyzing and condensing a tetra(lower alkyl)orthosilicate (i) in the substantial absence of a polymerizable substance other than said silicate, (ii) using acidic hydrolysis, (iii) and using a stoichiometric or substantially stoichiometric amount of water for hydrolysis, (iv) and in an organic solution of a polymer selected from the group consisting of poly(acrylates) and poly(methacrylates), the solvent in said solution having a relatively low boiling point, a fairly high volatility, and being substantially inert and miscible with water;
- (b) and subsequently coating the composition thereby produced on a heated non-sticking surface having a temperature of about 30°
to about 35°
C.;
(c) drying and curing the coat on said surface to produce said film; and
(d) subsequently removing said film from said surface. - View Dependent Claims (5, 6, 7, 8, 9)
- (b) and subsequently coating the composition thereby produced on a heated non-sticking surface having a temperature of about 30°
Specification