Basf Corporation

Gary J Kogowski

James Bennett

Graham Edmund Mc Kee

Heiner G&ouml;rrissen

Klaus M&uuml;hlbach

Graham Edmund McKee

Heiner Goerrissen

Steve Wasson

The invention provides a weatherable low gloss styrene copolymer composition which requires the addition of from 0.1 to 20% by weight of the total composition, of a partially crystalline polymer such as a polyalkylterephthalate, especially polybutyleneterephthalate or polyethyleneterephthalate, or polyethylenenaphthalate to a styrene copolymer (A). The low gloss styrene copolymer composition of the invention has a graft copolymer resin which results from polymerizing one or more monomers (A1) selected from the group consisting of (i) aromatic vinyl compounds, (ii) ethylenically unsaturated compounds, and (iii) mixtures thereof, in the presence of an elastomeric rubber (A2) in particulate form. The elastomeric rubber (A2) in particulate form results from polymerizing one or more monomers selected from the group consisting of (i) alkyl acrylates having from 1 to 8 carbon atoms, (ii) butadiene, (iii) olefin compounds, (iv) ethylenically unsaturated compounds, (v) aromatic vinyl compounds, (vi) polyfunctional monomers having a crosslinking effect, and (vii) mixtures thereof. The invention further provides a method of reducing the surface gloss of a styrene copolymer resin by adding to a styrene copolymer resin (A), from 0.1 to 20% by weight of a partially crystalline polymer such as a polyalkylterephthalate (B), based on the total weight of the composition. The invention also provides a composite suitable for use as exterior siding for a structure, the composite comprising at least one interior layer (I) comprising a thermoplastic resin, and at least one exterior layer (II) having a low gloss styrene copolymer comprising the low gloss styrene copolymer composition of the invention, wherein exterior layer (II) is continuos and coextensive with interior layer (I).

Styrene copolymer compositions having reduced surface gloss and composite articles incorporating same

Styrene copolymer compositions, especially ASA compositions, exhibit improved weatherability and color retention performance when processed according to the invention. Disclosed herein is a method of improving the weatherability and color retention performance of styrene copolymer compositions and exterior siding incorporating such styrene copolymer compositions. More specifically, a method is disclosed comprising improving the weatherability and color retention of styrene copolymer compositions, especially ASA compositions, which is advantageous with respect to cost and ease of manufacturing. Composite articles are also disclosed incorporating the foregoing improved styrene copolymer compositions as an exterior layer.

Method of improving the weatherbility and color retention performance of styrene copolymer compositions

A visual effect, such as a granite-look, is produced in a thermoplastic product by directly applying a sufficient amount of at least one color-containing thermoplastic resin system to the surface of an extruded sheet of a thermoplastic resin. The color-containing thermoplastic resin system is applied onto the extruded sheet after it emerges from the die and prior to it entering the rollstack.

Method and apparatus for applying a colorant to a thermoplastic to produce a visual effect

Granite-looking acrylonitrile/styrene/acrylate copolymers are provided by incorporating into the copolymer a colorant mixture comprising colored polyester or nylon fibers, titanium dioxide, and a metal salt of an aliphatic carboxylic acid as a dispersant.

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Farmington Hills, MI, United States of America

Gary J Kogowski