Patent US4290932A successfully refreshed from Google Patents.
US4290932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylic resin-acrylic microgel compositions
Assignee: BASF Corp
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Filing: 1979-11-27
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Granted: 1981-09-22
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Expires: 1999-11-27
Abstract
Abstract A method of making an acrylic microgel resin which comprises preparing an aqueous microgel emulsion of an acrylic resin which is crosslinked with a multifunctional crosslinking agent, removing water from the emulsion by coagulation and/or azeotropic distillation with an organic solvent in which the microgel is insoluble and which forms an azeotrope with water, and incorporating the thus dehydrated microgel into an acrylic resin which has been prepared by solution polymerization in organic solvent.
Inventors
- 👤 Howard J. Wright
- 👤 David P. Leonard
- 👤 Roger A. Etzell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:46
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/062; C08; C08L; C08L2205/00; C08L2205/02; C08L2205/14; C08L2205/18; C08L33/00; C08L33/04; C08L33/06; C08L67/00; Y; Y10; Y10S; Y10S524/00; Y10S524/916
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
266 words
A method of making an acrylic microgel resin for use in paint systems to provide coatings of improved pigment orientation and sag resistance which comprises preparing an aqueous microgel emulsion by the emulsion polymerization in water of a mixture of ethylenically unsaturated monomers, at least one of said monomers being an acrylic or methacrylic acid, or an --OH substituted alkyl ester thereof, and containing a --COOH or --OH group, and at least another of said monomers being selected from an alkyl ester of an acrylic or methacrylic acid, styrene and alpha-methyl styrene, and being free from --COOH and --OH groups, and a multifunctional crosslinking agent present in an amount of 5-70 percent by weight of the total weight of said ethylenically unsaturated monomers and crosslinking agent, removing water from the emulsion by coagulation and/or azeotropic distillation with an organic solvent in which the microgel is insoluble and which forms an azeotrope with water, and incorporating the microgel into an acrylic resin prepared by polymerizing two or more ethylenically unsaturated monomers in an organic solvent solution wherein at least one of said monomers is an --OH substituted alkyl ester of an acrylic or methacrylic acid and optionally a monomer containing a --COOH group selected from an acrylic or methacrylic acid, and another of said monomers being selected from an alkyl ester of an acrylic or methacrylic acid, styrene and alpha-methyl styrene, and being free from --COOH and --OH groups to provide said acrylic microgel resin wherein the amount of microgel solids is in the range of 5 to 15 percent by weight of the total resin solids.
Claim 2
Independent Claim
266 words
A method of making an acrylic microgel resin for use in paint systems to provide coatings of improved pigment orientation and sag resistance which comprises preparing an aqueous microgel emulsion by the emulsion polymerization in water of a mixture of ethylenically unsaturated monomers, at least one of said monomers being an acrylic or methacrylic acid, or an --OH substituted alkyl ester thereof, and containing a --COOH or --OH group, and at least another of said monomers being selected from an alkyl ester of an acrylic or methacrylic acid, styrene and alpha-methyl styrene, and being free from --COOH and --OH groups, and a multifunctional crosslinking agent present in an amount of 5-70 percent by weight of the total weight of said ethylenically unsaturated monomers and crosslinking agent, removing water from the emulsion by coagulation and/or azeotropic distillation with an organic solvent in which the microgel is insoluble and which forms an azeotrope with water, and incorporating the microgel into an acrylic resin prepared by polymerizing two or more ethylenically unsaturated monomers in an organic solvent solution wherein at least one of said monomers is an --OH substituted alkyl ester of an acrylic or methacrylic acid and optionally a monomer containing a --COOH group selected from an acrylic or methacrylic acid, and another of said monomers being selected from an alkyl ester of an acrylic or methacrylic acid, styrene and alpha-methyl styrene, and being free from --COOH and --OH groups to provide said acrylic microgel resin wherein the amount of microgel solids is in the range of 5 to 15 percent by weight of the total resin solids.
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein said ethylenically unsaturated monomer containing a --COOH or --OH group used to prepare said aqueous microgel emulsion is selected from acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate.
Claim 4
Dependent Claim
54 words
The method of claim 1 wherein the amount of ethylenically unsaturated monomer containing said --OH or --COOH groups used in the preparation of said microgel ranges from 10 to 90 weight percent and the amount of said ethylenically unsaturated monomer free from said --OH or --COOH groups ranges from 90 to 10 weight percent.
Claim 5
Dependent Claim
35 words
The method of claim 1 wherein the said --OH substituted alkyl ester of acrylic or methacrylic acid employed to prepare said acrylic resin is selected from hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate or hydroxypropyl methacrylate.
Claim 6
Dependent Claim
45 words
The method of claim 1 wherein the microgel emulsion is added to the components which are used to prepare the acrylic resin in organic solvent and water in the emulsion is azeotropically distilled concurrently with the preparation of the acrylic resin in the organic solvent.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein the emulsion is first dehydrated and then added to pre-formed acrylic resin in organic solvent.
Claim 8
Dependent Claim
34 words
The method of claim 1 wherein the emulsion is added to pre-formed acrylic resin in organic solvent and the emulsion is then dehydrated by azeotropic distillation in the presence of the pre-formed acrylic resin.
Claim 9
Dependent Claim
43 words
The method of claim 1 wherein the emulsion is dehydrated to the extent of removing at least 50% by weight of the water, prior to either concurrently preparing the acrylic resin or the addition of the pre-formed acrylic resin and further water removal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |