Particulate compositions and their manufacture
First Claim
1. A composition comprising particles which comprise a core material within a polymeric shell, wherein the core material comprises a hydrophobic substance, characterized in that the polymeric shell comprises a copolymer formed from a monomer blend which comprises,A) 30 to 90% by weight methacrylic acid B) 10 to 70% by weight alkyl ester of (meth)acrylic acid which is capable of forming a homopolymer of glass transition temperature in excess of 60°
- C. and C) 0 to 40% by weight other ethylenically unsaturated monomer.
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Accused Products
Abstract
A composition comprising particles which comprise a core material within a polymeric shell, wherein the core material comprises a hydrophobic substance, characterized in that the polymeric shell comprises a copolymer formed from a monomer blend which comprises, A) 30 to 90% by weight methacrylic acid B) 10 to 70% by weight alkyl ester of (meth)acrylic acid which is capable of forming a homopolymer of glass transition temperature in excess of 60° C. and C) 0 to 40% by weight other ethylenically unsaturated monomer. The core material can comprise an active ingredient selected from the group consisting of UV absorbers, UV reflectors, pigments, dyes, colorants, scale inhibitors, corrosion inhibitors, antioxidants, pour point depressants, wax deposition inhibitors, dispersants, flame retardants, biocides, active dye tracer materials and phase change materials. The composition has the advantage that the polymeric shell is highly impermeable to the core material even at elevated temperatures.
59 Citations
25 Claims
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1. A composition comprising particles which comprise a core material within a polymeric shell, wherein the core material comprises a hydrophobic substance, characterized in that the polymeric shell comprises a copolymer formed from a monomer blend which comprises,
A) 30 to 90% by weight methacrylic acid B) 10 to 70% by weight alkyl ester of (meth)acrylic acid which is capable of forming a homopolymer of glass transition temperature in excess of 60° - C. and
C) 0 to 40% by weight other ethylenically unsaturated monomer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- C. and
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12. A process of manufacturing a composition comprising particles, which comprise core material within a polymeric shell, wherein the core material comprises a hydrophobic substance, comprising the steps,forming a solution of monomer in a hydrophobic liquid, homogenizing the monomer solution into an aqueous phase to form an emulsion, subjecting the emulsion to polymerization conditions, and forming a dispersion of polymeric particles in the aqueous phase characterized in that the polymeric shell comprises a copolymer formed from a monomer blend which comprises,
A) 30 to 90% by weight methacrylic acid B) 10 to 70% by weight alkyl ester of (meth)acrylic acid which is capable of forming a homopolymer of glass transition temperature in excess of 60° - C. and
C) 0 to 40% by weight other ethylenically unsaturated monomer. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
- C. and
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22. An article comprising a particulate composition comprising a polymeric shell, in which the core material comprises a hydrophobic substance, characterized in that the polymeric shell comprises a copolymer formed from a monomer blend which comprises,
A) 30 to 90% by weight methacrylic acid B) 10 to 70% by weight alkyl ester of (meth)acrylic acid which is capable of forming a homopolymer of glass transition temperature in excess of 60° - C. and
C) 0 to 40% by weight other ethylenically unsaturated monomer. - View Dependent Claims (23)
- C. and
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24. A fiber which comprises a particulate composition comprising a polymeric shell, in which the core material comprises a hydrophobic substance, characterized in that the polymeric shell comprises a copolymer formed from a monomer blend which comprises,
A) 30 to 90% by weight methacrylic acid B) 10 to 70% by weight alkyl ester of (meth)acrylic acid which is capable of forming a homopolymer of glass transition temperature in excess of 60° - C. and
C) 0 to 40% by weight other ethylenically unsaturated monomer.
- C. and
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25. A process of forming a fiber containing particles comprising a core material within a polymeric shell in which the core material comprises a hydrophobic substance comprising the steps of,combining said particles with a liquid spinning dope, extruding the spinning dope, passing extruded dope through an atmosphere at a temperature of at least 150°
- C. and
4) collecting formed fibers, characterized and wherein the polymeric shell that has been formed from a copolymer derived from a monomer blend which comprises, A) 30 to 90% by weight methacrylic acid B) 10 to 70% by weight alkyl ester of (meth)acrylic acid which is capable of forming a homopolymer of glass transition temperature in excess of 60°
C. and 0 to 40% by weight other ethylenically unsaturated monomer.
- C. and
Specification