Light scattering material

• US 5,744,534 A
• Filed: 04/12/1996
• Issued: 04/28/1998
• Est. Priority Date: 08/10/1992
• Status: Expired due to Fees

• Current Assignee: Bridgestone Corporation
• Original Assignee: Bridgestone Corporation
• Inventors: Ishiharada, Minoru, Tanuma, Itsuo, Naito, Kazuo
• Primary Examiner(s): Marquis, Melvyn I.
• Application Number:
  US08/631,130
• Time in Patent Office: 746 Days
• Field of Search: 525/305, 525/271, 525/303, 524/442, 524/503, 524/506, 524/507, 524/523, 524/525, 524/533, 524/534
• US Class Current: 524/442
• CPC Class Codes: C08F 2/44 Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
• CPC Class Codes: C08G 77/04 Polysiloxanes
• CPC Class Codes: C08K 7/20 Glass
• CPC Class Codes: C08L 2205/22 Mixtures comprising a continuous polymer matrix in which are dispersed crosslinked particles of another polymer
• CPC Class Codes: C08L 25/06 Polystyrene
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: G02B 1/04 made of organic materials, e.g. plastics G02B1/08 takes precedence

Abstract

A light scattering material is prepared by mixing with and dispersing in a transparent elastomer matrix particles of a transparent material. The matrix has a Tg of lower than room temperature and the transparent material has a different index of refraction form the matrix.

Claims

1. A light scattering material comprising a non-crosslinked transparent elastomer matrix having a glass transition temperature of room temperature or lower, and particles of a transparent material dispersed therein having a different index of refraction from the matrix, wherein the difference in index of refraction between the transparent elastomer matrix and the particles of the transparent material is at least 0.03, wherein the particles of the transparent material have a size greater than the wavelength of incident light by a factor of 2 to 10, the amount of the transparent material particles blended is 0.01 to 10 parts by weight per 100 parts by weight of the transparent elastomer matrix, and said transparent elastomer matrix is selected from the group consisting of an acrylate ester polymer and an acrylate ester copolymer;

wherein said acrylate ester copolymer comprises an acrylate ester monomer and a monomer selected from the group consisting of a methacrylate ester, styrene, α

-methyl styrene, vinyl acetate, methyl vinyl ketone, phenyl vinyl ketone and vinyl benzoate monomer; and

wherein said acrylate ester polymer, said acrylate ester monomer and said methacrylate ester contain a substituent selected from the group consisting of a methyl, ethyl, butyl, propyl, stearyl, lauryl, 2-ethylhexyl, cyclohexyl, tetrahydrofurfuryl, aminoethyl, 2-hydroxyethyl, 3-hydroxypropyl, 3-chloro-2-hydroxypropyl, and trifluoroethyl radical.

2. The light scattering material of claim 1, wherein the particles of said transparent material comprise an inorganic material selected from the group consisting of quartz glass, multicomponent glass, sapphire and quartz.

3. The light scattering material of claim 1, wherein the particles of said transparent material comprise an organic material selected from the group consisting of polyamides, polystyrene, polymethyl methacrylate, polycarbonate, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyethylenevinyl acetate copolymers, polyvinyl alcohol, polyethylenepolyvinyl alcohol copolymers, fluoride resin, silicone resin, polyisoprene rubber, polybutadiene rubber, a styrene-butadiene copolymer, butyl rubber, halogenated butyl rubber, chloroprene rubber, acrylic rubber, EPDM, an acrylonitrile-butadiene copolymer, fluoride rubber, silicone rubber, acrylonitrile-butadiene-styrene resin, acrylonitrile-styrene copolymer resin, a styrene-butadiene copolymer, an acrylonitrile-EPDM-styrene terpolymer, a styrene-methyl methacrylate copolymer, methacrylic resin, epoxy resin, polymethyl pentene, allyl diglycol carbonate resin, spirane resin, amorphous polyolefin, polyallylate, polysulfone, polyallyl sulfone polyether sulfone, polyether imide, polyimide, polyethylene terephthalate, diallyl phthalate, polyester carbonate, paraffin, polybutene, and polyisobutylene.