Patent US4463032A successfully refreshed from Google Patents.
US4463032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making block-resistant soft polymer beads
Assignee: Roehm GmbH Darmstadt
•
Filing: 1982-12-09
•
Granted: 1984-07-31
•
Expires: 2002-12-09
Abstract
Abstract What are disclosed are a method for making non-blocking soft polymer beads by applying an adherent polymer deposit on the beads, said deposited polymer having a glass transition temperature at least 10° C. higher than the glass transition temperature of the soft polymer beads, which latter temperature is below 70° C., and non-blocking soft polymer beads made by this method.
Inventors
- 👤 Peter J. Arndt
- 👤 Werner Siol
- 👤 Walter Ludwig
- 👤 Franz Wenzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:27
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
100 words
A method for treating beads consisting essentially of a core of a first, softer, acrylic polymer prepared by a bead polymerization process and having a glass transition temperature below 70° C. to render such beads non-blocking, which method proceeds in the absence of a foaming agent and comprises depositing an adherent film of a second, harder, film forming polymer onto said beads from a dispersion of said second polymer, and then drying the treated beads, said second, harder, film forming polymer having a glass transition temperature which is at least 10° C. higher than that of said first, softer, polymer.
Claim 2
Independent Claim
100 words
A method for treating beads consisting essentially of a core of a first, softer, acrylic polymer prepared by a bead polymerization process and having a glass transition temperature below 70° C. to render such beads non-blocking, which method proceeds in the absence of a foaming agent and comprises depositing an adherent film of a second, harder, film forming polymer onto said beads from a dispersion of said second polymer, and then drying the treated beads, said second, harder, film forming polymer having a glass transition temperature which is at least 10° C. higher than that of said first, softer, polymer.
Claim 3
Dependent Claim
18 words
A method as in claim 1 wherein said soft polymer has a glass transition temperature below 50° C.
Claim 4
Dependent Claim
21 words
A method as in claim 1 wherein said dispersion is a dispersion of a polymer which does not form a film.
Claim 5
Dependent Claim
25 words
A method as in claim 1 wherein said polymer dispersion comprises a polymer comprising at least one ester of acrylic acid or of methacrylic acid.
Claim 6
Dependent Claim
23 words
A method as in claim 1 wherein said polymer dispersion contains less than 3 weight percent of emulsifiers, based on the polymer solids.
Claim 7
Dependent Claim
23 words
A method as in claim 1 wherein said polymer dispersion contains less than 1 weight percent of emulsifiers, based on the polymer solids.
Claim 8
Dependent Claim
23 words
A method as in claim 1 wherein said dispersion is stabilized with an emulsifier or emulsifiers effective only over a certain pH range.
Claim 9
Dependent Claim
32 words
A method as in claim 1 wherein the dry weight of polymer deposit on the bead polymer is from 0.2 to 20 weight percent of the dry weight of the bead polymer.
Claim 10
Dependent Claim
32 words
A method as in claim 1 wherein the dry weight of polymer deposit on the bead polymer is from 0.5 to 5 weight percent of the dry weight of the bead polymer.
Claim 11
Dependent Claim
32 words
A method as in claim 1 wherein said beads are first washed, then suspended in said dispersion having a solids content from 2 to 50 percent by weight, then separated and dried.
Claim 12
Dependent Claim
32 words
A method as in claim 1 wherein said beads are first washed, then suspended in said dispersion having a solids content from 5 to 20 percent by weight, then separated and dried.
Claim 13
Dependent Claim
30 words
A method as in claim 1 wherein said dispersion is added to a suspension of said bead polymer and polymer is deposited on the beads from said dispersion by precipitation.
Claim 14
Dependent Claim
19 words
A method as in claim 12 wherein said dispersion is added to said suspension at temperature above 25° C.
Claim 15
Dependent Claim
23 words
A method as in claim 12 wherein the precipitation of said polymer on said beads is effected by the presence of an acid.
References Cited (Backward Citations)
US2448524A
Cited
US3102050A
Cited
DE2148224A1
Cited
US3911193A
Cited
US4097553A
Cited
JPS5465791A
Cited
US4368218A
Cited
US4307134A
Cited
US4333970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |