Patent US4859740A successfully refreshed from Google Patents.
US4859740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particulate multiphase polymers
Assignee: Momentive Performance Materials GmbH
•
Filing: 1988-02-10
•
Granted: 1989-08-22
•
Expires: 2008-02-10
Abstract
Abstract Particulate, multiphase polymers which have a core (A) and an overlying shell (B) wherein the core (A) is an organic, rubber-like polymer comprising polymerized olefinically unsaturated monomer units having softening point temperatures below 0° C. and wherein the shell (B) is an organopolysiloxane are obtained by producing in a first stage an organic rubber-like polymer in latex form by emulsion polymerization and, in a second stage, the latex particles of the first stage are surrounded with a shell (B) or organopolysiloxane by polymerizing low molecular weight organosiloxanes in the presence of the latex particles of the first stage.
Inventors
- 👤 Volker Damrath
- 👤 Christian Lindner
- 👤 Hans-Jurgen Kress
- 👤 Dieter Wittmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:49
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C08G77/442; Y; Y10; Y10S; Y10S525/00; Y10S525/902
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
43 words
Particulate, multiphase polymers which have a core (A) and an overlying shell (B) wherein the core (A) is an organic, rubbery polymer comprising polymerized olefinically unsaturated monomer units having softening point temperatures below 0° C. and wherein the shell (B) is an organopolysiloxane.
Claim 2
Dependent Claim
43 words
Particulate, multiphase polymers which have a core (A) and an overlying shell (B) wherein the core (A) is an organic, rubbery polymer comprising polymerized olefinically unsaturated monomer units having softening point temperatures below 0° C. and wherein the shell (B) is an organopolysiloxane.
Claim 3
Dependent Claim
23 words
Particulate multiphase polymers as claimed in claim 1, in which the ratio by weight of (A) to (B) is from 0.1:99.9 to 90:10.
Claim 4
Dependent Claim
18 words
Particulate multiphase polymers as claimed in claim 1 having average particle diameters of from 0.05 to 10 μm.
Claim 5
Dependent Claim
22 words
Particulate multiphase polymers as claimed in claim 1 wherein the cores (A) have an average size of from 0.05 to 2 μm.
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) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |