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US 6,713,532 B2Granted
Solid polymer dispersions and method for their preparation
AssigneeGeneral Electric Company
InventorsNavjot Singh, Joseph Michael Anostario
Life of this patent
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Abstract
Solid blends of rubbery polymers and amorphous or crystalline polymers, said blends being free-flowing at temperatures lower than the glass transition temperature or crystalline melting temperature of the amorphous or crystalline polymer, are prepared by intimate mixing procedures. In general, said mixing conditions include high shear conditions sufficient to convert polymer A to dispersed particles coated with polymer B and produce a free-flowing powder blend.
Claims22
A method for preparing a blend, said blend comprising:
- a polyorganosiloxane (A) having at least one of a glass transition temperature (Tga) or a melting temperature (Tma),
- a vinylaromatic polymer (B) having at least one of a glass transition temperature (Tgb) or melting temperature (Tmb), wherein
- Tga<Tgb, when polymers A and B are amorphous,
- Tma<Tmb when both polymers A and B are crystalline,
- Tga<Tmb when polymer A is amorphous and polymer B is crystalline, and
- Tma<Tgb when polymer A is crystalline and polymer B is amorphous, which comprises intimately mixing said polymers at a suitable temperature between the lower of Tga and Tma and the value of Tgb, for a time and under shear conditions sufficient to convert polymer A to dispersed particles coated with polymer B and produce a free-flowing powder blend.
3 more elements
A method for preparing a blend, said blend comprising:
- a polydimethylsiloxane (A) having at least one of a glass transition temperature (Tga) or a melting temperature (Tma),
- a polystyrene powder (B) having at least one of a glass transition temperature (Tgb) or melting temperature (Tmb), wherein
- Tga<Tgb when polymers A and B are amorphous,
- Tma<Tmb when both polymers A and B are crystalline,
- Tga<Tmb when polymer A is amorphous and polymer B is crystalline, and
- Tma<Tgb when polymer A is crystalline and polymer B is amorphous,
- which comprises intimately mixing said polymers at a suitable temperature between the lower of Tga and Tma and the value of Tgb, for a time and under shear conditions sufficient to convert polymer A to dispersed particles coated with polymer B and produce a free-flowing powder blend.
4 more elements
A composition comprising a blend of:
- a polyorganosiloxane (A) having at least one of a glass transition temperature (Tga) or a melting temperature (Tma),
- a vinylaromatic polymer (B) having at least one of a glass transition temperature (Tgb) or melting temperature (Tmb), wherein
- Tga<Tgb when polymers A and B are amorphous,
- Tma<Tmb when both polymers A and B are crystalline,
- Tga<Tmb when polymer A is amorphous and polymer B is crystalline, and
- Tma<Tgb when polymer A is crystalline and polymer B is amorphous,
- produced by the process of intimately mixing said polymers at a suitable temperature between the lower of Tga and Tma and the value of Tgb for a time and under shear conditions sufficient to convert polymer A to dispersed particles coated with polymer B and produce a free-flowing powder blend.
4 more elements
A composition comprising a blend of:
- a polydimethylsiloxane (A) having at least one of a glass transition temperature (Tga) or a melting temperature (Tma),
- a polystyrene powder (B) having at least one of a glass transition temperature glass transition temperature (Tgb) or a melting temperature (Tmb), wherein
- Tga<Tgb when polymers A and B are amorphous,
- Tma<Tmb when both polymers A and B are crystalline,
- Tga<Tmb when polymer A is amorphous and polymer B is crystalline, and
- Tma<Tgb when polymer A is crystalline and polymer B is amorphous,
- produced by the process of intimately mixing said polymers at a suitable temperature between the lower of Tga and Tma and the value of Tgb, for a time and under shear conditions sufficient to convert polymer A to dispersed particles coated with polymer B and produce a free-flowing powder blend.
4 more elements
Dependencies are inferred from the claim text.