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US 12,215,233 B2Granted
Polydiorganosiloxane compositions and methods for use thereof in forming wood plastic composites
AssigneeDow Silicones Corporation
InventorsJodi Mecca, James Keenihan, Marc-Andre Courtemanche, Keith Bruce, Igor Chorvath, Sean Gaal
Life of this patent
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Abstract
A polydiorganosiloxane is useful in a composition and a method for preparing a wood plastic composite article. The wood plastic composite article is useful as a building material. The polydiorganosiloxane may be added to the composition in liquid form or may form part of a solid carrier component used to make the wood plastic composite article.
Claims20
A composition for preparing a wood plastic composite article, said composition comprising:
- 40 weight % to 70 weight % of (a) a lignocellulosic-based filler;
- 29 weight % to 59 weight % of (b) an ethylene-based polymer;
- 1 weight % to 4 weight % of (c) a trialkyl-siloxy terminated polydialkylsiloxane of formula
- where each R is an independently selected alkyl group of 1 to 18 carbon atoms, and subscript x has a value sufficient to give the polydiorganosiloxane a viscosity of 5,000 mPa·s to 50,000 mPa·s as measured at 25° C. at 0.1 RPM to 50 RPM on a Brookfield Dy-III cone & plate viscometer with #CP-52 spindle;
- and
- 0 to 4 weight % of (d) a maleated ethylene-based polymer;
- each based on combined weights of starting materials (a), (b), (c), and (d) in said composition.
4 more elements
A method for preparing a wood plastic composite article comprises:
- (1) preparing composition for preparing a wood plastic composite article by combining starting materials comprising:
- 40 weight % to 70 weight % of (a) a lignocellulosic-based filler;
- 29 weight % to 59 weight % of (b) an ethylene-based polymer;
- 1 weight % to 4 weight % of (c) a trimethylsiloxy-terminated polydialkylsiloxane of formula
- where each R is an independently selected alkyl group of 1 to 18 carbon atoms, and subscript x has a value sufficient to give the polydiorganosiloxane a viscosity of 5,000 mPa·s to 50,000 mPa·s as measured at 25° C. at 0.1 RPM to 50 RPM on a Brookfield Dy-III cone & plate viscometer with #CP-52 spindle;
- and
- 0 to 4 weight % of (d) a maleated ethylene-based polymer;
- each based on combined weights of starting materials (a), (b), (c), and (d) in said composition;
- and
- (2) forming the wood plastic composite article from the composition.
7 more elements
A solid carrier component comprising:
- 10 weight % to 30 weight % of (i) a trimethylsiloxy-terminated polydialkylsiloxane of formula
- where each R is an independently selected alkyl of 1 to 18 carbon atoms, and subscript x has a value sufficient to give the polydiorganosiloxane a viscosity of 5,000 mPa·s to 50,000 mPa·s measured at 25° C. at 0.1 RPM to 50 RPM on a Brookfield Dy-III cone & plate viscometer with #CP-52 spindle;
- and
- 70 weight % to 90 weight % of (ii) a polymer component selected from the group consisting of:
- an ethylene-based polymer,
- a maleated ethylene-based polymer, and
- a combination of both the ethylene-based polymer and the maleated-ethylene based polymer;
- and
- 0 to 10% of (iii) a filler,
- wherein the solid carrier component has particolate form.
7 more elements
Dependencies are inferred from the claim text.