Matte polycarbonate compositions, articles and method to make them
AssigneeTrinseo Europe GmbH
InventorMark Vreys
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Abstract
A polycarbonate article is described that is formed from a thermoplastic composition comprised of a polycarbonate or polycarbonate copolymer; and at least 1% by weight of a polysilsesquioxane (PSQ) solid particles that have a decomposition temperature of at least 350° C. and an acicular filler, which desirably has an aspect ratio of 2 to 50. The PSQ particles are desirably spherical. The article is formed by heating the composition and shaping the heated composition, wherein the article and the filler and PSQ particles are dispersed therein, wherein the PSQ particles desirably maintain their spherical morphology.
Claims15
A thermoplastic composition comprising a polycarbonate or polycarbonate copolymer;
- and at least 1% by weight of a polysilsesquioxane solid particles and an acicular filler, wherein the acicular filler and polysilsesquioxane particles are present in the composition at a mass ratio of acicular filler/polysilsesquioxane particles of 10 to 0.1.
A method of forming an article comprising,
- (i) providing a composition comprised of a polycarbonate or polycarbonate copolymer;
- and at least 1% by weight of a polysilsesquioxane solid particles that have a decomposition temperature of at least 350° C. and an acicular filler, wherein the acicular filler and polysilsesquioxane particles are present in the composition at a mass ratio of acicular filler/polysilsesquioxane particles of 10 to 0.1,
- (ii) heating the composition of step (i) to a temperature sufficient to melt the polycarbonate or copolymer of polycarbonate but insufficient to decompose the polysilsesquioxane solid particles, and
- (iii) shaping the heated composition to form an article having the polysilsesquioxane solid particles and acicular filler dispersed therein.
An article comprised of polycarbonate or polycarbonate copolymer having dispersed therein a filler having an aspect ratio of at least 2 to 50 and polysilsesquioxane solid particles having an average sphericity of at least 0.9, wherein the article has a gloss of 20 or less measured according to ISO 2813 with a 60° angle of incidence from a sample made using a mirror finish tool.
Dependencies are inferred from the claim text.