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US 11,377,561 B2Granted
Alkenyl-functional polydiorganosiloxane compositions and methods for use thereof in forming wood plastic composites
AssigneeDow Silicones Corporation
InventorsIgor Chorvath, Marc-Andre Courtemanche, James Keenihan, Keith Bruce, Sean Gaal, Jodi Mecca
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Abstract
An alkenyl-functional 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 in liquid form to a composition, or may form part of a solid carrier component, used to make the wood plastic composite article.
Claims15
A composition for preparing a wood plastic composite article, said composition comprising:
- 15 weight % to 70 weight % of (a) a lignocellulosic-based filler;
- 29.5 weight % to 84.5 weight % of (b) an ethylene-based polymer;
- 0.5 weight % to 6 weight % of (c) a polydiorganosiloxane of unit formula:
- (R2R′SiO1/2)a(R3SiO1/2)b(R2SiO2/2)c(RR′SiO2/2)d, where each R is an independently selected monovalent hydrocarbon group of 1 to 18 carbon atoms that is free of aliphatic unsaturation, each R′ is an independently selected alkenyl group of 2 to 18 carbon atoms, subscript a is 0 to 2, subscript b is 0 to 2, a quantity (a+b)=2, subscript c≥0, subscript d≥0, a quantity (a+d)≥1, and a quantity (a+b+c+d) is sufficient to give the polydiorganosiloxane a viscosity of 2,000 mPa·s to 60,000 mPa·s at 25° C. measured at 0.1 to 50 RPM on a Brookfield DV-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, said method comprising:
- (1) combining starting materials comprising
- 15 weight % to 70 weight % of (a) a lignocellulosic-based filler;
- 29.5 weight % to 84.5 weight % of (b) an ethylene-based polymer;
- 0.5 weight % to 6 weight % of (c) a polydiorganosiloxane comprising unit formula:
- (R2R′SiO1/2)a(R3SiO1/2)b(R2SiO2/2)c(RR′SiO2/2)d, where each R is an independently selected monovalent hydrocarbon group of 1 to 18 carbon atoms that is free of aliphatic unsaturation, each R′ is an independently selected alkenyl group of 2 to 18 carbon atoms, subscript a is 0 to 2, subscript b is 0 to 2, a quantity (a+b)=2, subscript c≥0, subscript d≥0, a quantity (a+d)≥1, and a quantity (a+b+c+d) is sufficient to give the polydiorganosiloxane a viscosity of 2,000 mPa·s to 60,000 mPa·s at 25° C. measured at 0.1 to 50 RPM on a Brookfield DV-III cone & plate viscometer with #CP-52 spindle;
- each based on combined weights of starting materials (a), (b), (c), and (d);
- thereby preparing a composition;
- and
- (2) preparing the wood plastic composite article from the composition.
6 more elements
Dependencies are inferred from the claim text.