Claims
- 1. A particulate composition of matter adapted for developing electrostatic images consisting essentially of finely divided particles comprising by weight 5 to 15 % of a colored material and 95 to 85 % of a resin mixture consisting essentially of:
- A. 40 to 60 % by weight of a polymer having about 50 % of the recurring units thereof derived from at least one styrene monomer of the formula: ##EQU6## wherein: R is hydrogen or methyl, and the balance of such recurring units derived from at least one alkyl methacrylate monomer wherein alkyl comprises 1-4 carbon atoms,
- B. 20 to 40 % by weight of a homopolymer of butyl acrylate or butyl methacrylate or a copolymer of butyl acrylate or butyl methacrylate with up to 80 % by weight of methyl acrylate or methyl methacrylate, and
- C. 5 to 20 % by weight of a polymeric plasticizer selected from polyvinyl butyral, polyethylene and co(vinylacetate/ethylene), said particles having a diameter between 1 and 30 microns.
- 2. A particulate composition of matter according to claim 1, wherein resin (A) is polystyrene.
- 3. A particulate composition of matter according to claim 1, wherein resin (A) comprises 50 to 60 % by weight of recurring units deriving from at least one styrene monomer of the formula: ##EQU7## wherein: R is hydrogen or methyl, and 50 to 40 % by weight of at least one alkyl methacrylate, wherein the alkyl group comprises 1 to 4 carbon atoms.
- 4. A particulate composition of matter according to claim 3, wherein resin (A) is a copolymer of styrene and isobutyl methacrylate.
- 5. A particulate composition of matter according to claim 3, wherein resin (A) is a copolymer of styrene, .alpha.-methyl styrene and isobutyl methacrylate.
- 6. A particulate composition of matter according to claim 1, wherein resin (B) is a homopolymer of n-butyl methacrylate.
- 7. A particulate composition of matter according to claim 1, wherein resin (B) is a copolymer of n-butyl methacrylate with up to 80 % by weight of methyl methacrylate.
- 8. A particulate composition of matter according to claim 1, wherein resin (B) is a copolymer of n-butyl methacrylate and methyl methacrylate in a ratio of 25-75 % by weight.
Priority Claims (1)
Number |
Date |
Country |
Kind |
61855/71 |
Jun 1971 |
UK |
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Parent Case Info
The invention relates to the manufacture of an electrostatic toner material and to the electrostatic toner material thus obtained, the application being a continuation-in-part application of United States Patent Application Ser. No. 162,303 filed July 13, 1971 now abandoned.
US Referenced Citations (3)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
162303 |
Jul 1971 |
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