EP0307855A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Gelatin-grafted polymer particles
Assignee: Eastman Kodak Co
•
Filing: 1988-09-13
•
Granted: —
•
Expires: 2008-09-13
Abstract
Abstract There are disclosed polymer particles that are individually covered with a layer of gelatin that is covalently bonded thereto. The particles are useful as photographic matting agents.
Inventors
- 👤 Pranab Bagchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 07:14
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/95; Y; Y10; Y10S; Y10S430/00; Y10S430/151; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
20 words
Polymer particles characterized in that the particles are individually covered with a layer of gelatin that is covalently bonded thereto.
Claim 2
Dependent Claim
20 words
Polymer particles characterized in that the particles are individually covered with a layer of gelatin that is covalently bonded thereto.
Claim 3
Dependent Claim
46 words
Polymer particles according to Claim 1 wherein said polymer particles comprise a polymer comprising an active halogen atom, an isocyanate group, an epoxide group, an aldehyde group, a chloroethylsulfone group, a vinyl sulfone group, an amine group, a carboxylic acid group, or an active methylene group.
Claim 4
Dependent Claim
55 words
Polymer particles according to Claims 1 or 2 wherein said polymer particles comprise from 0.1 to 100 mole percent of a copolymer comprising an active halogen atom, an isocyanate group, an epoxide group, an aldehyde group, a chloroethylsulfone group, a vinyl sulfone group, an amine group, a carboxylic acid group, or an active methylene group.
Claim 5
Dependent Claim
58 words
Polymer particles according to Claims 1-3 wherein the polymer particles comprise a polymer comprising repeating units of the formula: A represents recurring units derived from one or more monomers that are capable of covalently bonding with gelatin, B represents recurring units derived from one or more other ethylenically unsaturated monomers, and x represents 0.1 to 100 mole percent.
Claim 6
Dependent Claim
33 words
Polymer particles according to Claims 1-4 wherein the particles have a mean diameter of 1 to 15 microns and the gelatin layer has a mean diameter of 2 to 6 nm when dry.
Claim 7
Dependent Claim
13 words
Polymer particles according to Claims 1-5 wherein the polymer particles are spherical beads.
Claim 8
Dependent Claim
12 words
An element comprising a support having thereon particles according to Claims 1-6.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.