US5135970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of crosslinked polymer microparticles in paints as filler substitute and/or as crosslinking filler
Assignee: Hoechst AG
•
Filing: 1990-09-28
•
Granted: 1992-08-04
•
Expires: 2010-09-28
Abstract
Abstract The invention relates to the use of crosslinked polymer microparticles having an average particle size of at most 5 μm and a glass transition temperature (Tg) of at least +30° C. in aqueous paint preparations as filler and/or as partial substitute of white pigments, in particular of titanium dioxide. Among other things, the corresponding paints show increased spreading power, less tendency for sedimentation and reduced crater formation.
Inventors
- 👤 Michael Honel
- 👤 Gerd Walz
- 👤 Peter Ziegler
- 👤 Uwe Kubillus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:24
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/44; C09D5/4488; C09D5/4492; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C09D163/00; C09D5/02; C09D5/024; C09D5/028
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
237 words
An aqueous dispersion, which is stable to flocculation, of crosslinked polymer microparticles having average particle sizes of at most 5 μm, a crosslinked polymer microparticle content of at least 20% by weight, relative to the dispersion and a glass transition temperature (Tg) of at least +30° C., in which the crosslinked polymer microparticles have been prepared by reaction of self-emulsifying epoxy-containing compounds (a) having an epoxy equivalent weight between 250 and 10,000 and being condensation products of A) 50 to 80% by weight of an epoxy compound containing at least two epoxy groups per molecule and an epoxy equivalent weight of 100 to 2,000. B) 35 to 17% by weight of a condensation product of an aliphatic polyol having an average molecular weight (Mw) of 200 to 20,000, with an epoxy compound having at least two epoxy groups per molecule and an epoxy equivalent weight of 100 to 2,000 and optionally a mono- and/or polyisocyanate, in which the equivalent ratio of the OH groups to the epoxy groups is 1:0.85 to 1:3.5, the amount of any mono- and/or polyisocyanates present is 0.056 to 5% by weight, relative to the amount of aliphatic polyol and epoxy compound, and the epoxy equivalent weight of this condensation product is between 200 and at least 50,000, with a polyamine B) and in which the functionality of A) is greater than one and of B) is identical to or greater than two.
Claim 2
Dependent Claim
237 words
An aqueous dispersion, which is stable to flocculation, of crosslinked polymer microparticles having average particle sizes of at most 5 μm, a crosslinked polymer microparticle content of at least 20% by weight, relative to the dispersion and a glass transition temperature (Tg) of at least +30° C., in which the crosslinked polymer microparticles have been prepared by reaction of self-emulsifying epoxy-containing compounds (a) having an epoxy equivalent weight between 250 and 10,000 and being condensation products of A) 50 to 80% by weight of an epoxy compound containing at least two epoxy groups per molecule and an epoxy equivalent weight of 100 to 2,000. B) 35 to 17% by weight of a condensation product of an aliphatic polyol having an average molecular weight (Mw) of 200 to 20,000, with an epoxy compound having at least two epoxy groups per molecule and an epoxy equivalent weight of 100 to 2,000 and optionally a mono- and/or polyisocyanate, in which the equivalent ratio of the OH groups to the epoxy groups is 1:0.85 to 1:3.5, the amount of any mono- and/or polyisocyanates present is 0.056 to 5% by weight, relative to the amount of aliphatic polyol and epoxy compound, and the epoxy equivalent weight of this condensation product is between 200 and at least 50,000, with a polyamine B) and in which the functionality of A) is greater than one and of B) is identical to or greater than two.
Claim 3
Dependent Claim
19 words
An aqueous dispersion as claimed in claim 1, wherein the aqueous paint preparations are electrocoating compositions or filler paints.
Claim 4
Dependent Claim
32 words
An aqueous dispersion as claimed in claim 1, wherein the average particle size is in the range from 0.3 to 1.0 μm and the glass transition temperature is 60° to 140° C.
Claim 5
Dependent Claim
17 words
An aqueous dispersion as claimed in claim 1, wherein the crosslinked polymer microparticles contain active crosslinking centers.
Claim 6
Dependent Claim
23 words
An aqueous dispersion as claimed in claim 4, wherein blocked isocyanate groups which block under the curing conditions serve as active crosslinking centers.
Claim 7
Dependent Claim
16 words
An aqueous dispersion as claimed in claim 5, wherein the crosslinked polymer microparticles are additionally self-crosslinking.
Claim 8
Dependent Claim
43 words
An aqueous dispersion as claimed in claim 1, wherein the crosslinked polymer microparticles are used in the form of an aqueous dispersion which is stable to flocculation and which contains at least 20% by weight of crosslinked polymer microparticles, relative to the dispersion.
Claim 9
Dependent Claim
15 words
An aqueous dispersion as claimed in claim 7, wherein the epoxy-containing compounds (a) are self-emulsifying.
Claim 10
Dependent Claim
19 words
An aqueous dispersion as claimed in claim 1, wherein the polyamines (b) are m-xylylenediamine or bishexamethylenediamine, neopentanediamine or cyclohexanediamine.
Claim 11
Dependent Claim
23 words
An aqueous dispersion as claimed in claim 1, wherein the epoxy equivalent weight of the epoxy-containing compounds (a) used is 450 to 2,500.
Claim 12
Dependent Claim
26 words
An aqueous dispersion as claimed in claim 1, wherein the aliphatic polyols according to (γ) are polyalkylene glycols having molecular weights (Mw) of 600 to 12,000.
Claim 13
Dependent Claim
26 words
An aqueous dispersion as claimed in claim 1, wherein the amount of the crosslinked polymer microparticles is 40 to 65% by weight, relative to the dispersion.
Claim 14
Dependent Claim
26 words
An aqueous paint preparation which may contain white pigments and contains an aqueous dispersion as claimed in claim 1, or the crosslinked polymer microparticles isolated therefrom.
Claim 15
Dependent Claim
28 words
An aqueous paint preparation as claimed in claim 13, wherein the amount of crosslinked polymer microparticles (solid) is 15 to 90% by weight, relative to the white pigment.
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) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-04 | 2004-02-03 | 2004-08-04 | $7700.00 | Window Closed / Lapsed |