Patents Assigned to Zeneca Resins BV
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Patent number: 6258888Abstract: Aqueous emulsion of an organic polymeric material (preferably olefinic), said polymeric material comprising: 1) a hydrophobic polymer part which has a polymodal particle size distribution, and 2) an oligomer part bearing acid groups which imparts or is capable of imparting reversibility to the polymeric material of the emulsion, this being realized, if necessary, by sufficient of the acid groups being in ionised form. lonisation is usually achieved by raising pH to ≧7 (neutralizing). The polymer emulsion is particularly useful for inks and overprint lacquer formulations, and for paint formulations.Type: GrantFiled: April 20, 1998Date of Patent: July 10, 2001Assignee: Zeneca Resins BVInventors: Antonius Carolus Ida Adrianus Peters, Gerardus Cornelis Overbeek
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Patent number: 6017992Abstract: Process for the production of an aqueous polymer emulsion which process comprises:a) preparing a low molecular weight polymer containing acid-functional groups using a free-radical polymerisation process which employs a free-radical initiator and, for the purpose of controlling molecular weight, a transition metal chelate complex, wherein said low molecular weight polymer has a number average molecular weight within the range of from 500 to 50,000;b) conducting an aqueous emulsion polymerisation process to form an aqueous emulsion of a hydrophobic polymer from at least one olefinically unsaturated monomer, wherein the low molecular weight polymer of step a) is introduced to the aqueous medium of said emulsion polymerisation process before the start of and/or during said emulsion polymerisation process and becomes dissolved or dispersed in said aqueous medium.Type: GrantFiled: June 30, 1998Date of Patent: January 25, 2000Assignees: Zeneca Limited, Zeneca Resins BVInventors: David Mark Haddleton, John Christopher Padget, Gerardus Cornelis Overbeek
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Patent number: 5804632Abstract: Process for the production of an aqueous polymer emulsion which process comprises:a) preparing a low molecular weight polymer containing acid-functional groups using a free-radical polymerisation process which employs a free-radical initiator and, for the purpose of controlling molecular weight, a transition metal chelate complex, wherein said low molecular weight polymer has a number average molecular weight within the range of from 500 to 50,000;b) conducting an aqueous emulsion polymerisation process to form an aqueous emulsion of a hydrophobic polymer from at least one olefinically unsaturated monomer, wherein the low molecular weight polymer of step a) is introduced to the aqueous medium of said emulsion polymerisation process before the start of and/or during said emulsion polymerisation process and becomes dissolved or dispersed in said aqueous medium.Type: GrantFiled: January 29, 1996Date of Patent: September 8, 1998Assignees: Zeneca Limited, Zeneca Resins BVInventors: David Mark Haddleton, John Christopher Padget, Gerardus Cornelis Overbeek
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Patent number: 5661212Abstract: Coating composition comprising a liquid carrier-based dispersion of at least one olefinic addition polymer, said dispersion of polymer(s) providing polymer bound tertiary amino groups and polymer bound acetoacetyl groups.The compositions are suitable for providing protective or decorative coatings for a range of substrates and have excellent adhesion and wet adhesion properties.The olefinic addition polymers having polymer bound amino and acetoacetyl groups are also claimed.Type: GrantFiled: April 7, 1995Date of Patent: August 26, 1997Assignee: Zeneca Resins BVInventors: Peter Lear, Hendricus Cornelis Goos, Gerardus Cornelis Overbeek, Emile Johannes Maria Stevens
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Patent number: 5637409Abstract: Aqueous coating composition for a plastics, especially a polypropylene, substrate comprising a stable aqueous dispersion derived from dispersing into water with the aid of a surfactant(s) an organic solvent solution of a composition comprising a chlorinated polyolefine(s), at least one olefinically unsaturated monomer which is polymerisable to a polymer during and/or after coating formation and a filmogenic polymer(s).Type: GrantFiled: May 25, 1995Date of Patent: June 10, 1997Assignees: Zeneca Limited, Zeneca Resins BVInventors: Emile J. M. Stevens, Peter Lear
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Patent number: 5446083Abstract: Aqueous coating composition for a plastics, especially a polypropylene, substrate comprising a stable aqueous dispersion derived from dispersing into water with the aid of a surfactant(s) an organic solvent solution of a composition comprising a chlorinated polyolefine(s), at least one olefinically unsaturated monomer which is polymerisable to a polymer during and/or after coating formation and a filmogenic polymer(s).Type: GrantFiled: June 5, 1992Date of Patent: August 29, 1995Assignee: Zeneca Resins BVInventors: Emile J. M. Stevens, Peter Lear