Patent US4663383A successfully refreshed from Google Patents.
US4663383A
Expired / Lapsed
US
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Silica coated olefin-acid copolymer molding pellets
Assignee: EIDP Inc
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Filing: 1986-02-25
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Granted: 1987-05-05
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Expires: 2006-02-25
Abstract
Abstract Ethylene copolymers or terpolymers containing repeating units derived from ethylenically unsaturated carboxylic acids which have been surface treated with from 0.005 to 2 wt. % silica to reduce surface tackiness are disclosed.
Inventors
- 👤 David J. Lowe
- 👤 Richard J. Powell
- 👤 Malcolm S. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:20
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; C08K; C08K3/00; C08K3/34; C08K3/36; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A normally solid addition polymer containing at least 25 weight percent repeating units derived from ethylene, at least 50 weight percent units derived from an α-olefin containing 2-10 carbon atoms, from 2 to 50 weight percent repeating units derived from an ethylenically unsaturated carboxylic acid containing 3 to 8 carbon atoms with from 0 to 90 percent of the carboxylic acid groups neutralized with metal ions, which has on its surface a coating consisting essentially of 0.034 to 13.4 g/m 2 of silica having a particle size of from 0.004 to 5 μm provided that the amount of the silica surface coating is from about 0.005 to about 2 weight percent of the polymer.
Claim 2
Dependent Claim
114 words
A normally solid addition polymer containing at least 25 weight percent repeating units derived from ethylene, at least 50 weight percent units derived from an α-olefin containing 2-10 carbon atoms, from 2 to 50 weight percent repeating units derived from an ethylenically unsaturated carboxylic acid containing 3 to 8 carbon atoms with from 0 to 90 percent of the carboxylic acid groups neutralized with metal ions, which has on its surface a coating consisting essentially of 0.034 to 13.4 g/m 2 of silica having a particle size of from 0.004 to 5 μm provided that the amount of the silica surface coating is from about 0.005 to about 2 weight percent of the polymer.
Claim 3
Dependent Claim
19 words
The polymer of claim 1 in the form of pellets weighing from 0.4 to 18 grams per 100 pellets.
Claim 4
Dependent Claim
21 words
The polymer pellets of claim 2 wherein the carboxylic acid derived repeating units are derived from acrylic acid or methacrylic acid.
Claim 5
Dependent Claim
20 words
The polymer pellets of claim 3 wherein up to 90 percent of the acid groups are reacted with metal ions.
Claim 6
Dependent Claim
20 words
The polymer pellets of claim 4 wherein pellets have from 0.067 to 6.7 g/m 2 of silica on their surface.
Claim 7
Dependent Claim
21 words
The polymer pellets of claim 5 wherein the pellets have from 0.13 to 0.34 g/m 2 of silica on their surface.
Claim 8
Dependent Claim
25 words
The polymer pellets of claim 5 wherein the polymer is a terpolymer of ethylene, butyl acrylate and 4-15 weight percent methacrylic acid or acrylic acid.
Claim 9
Dependent Claim
21 words
The polymer pellets of claim 7 wherein the polymer contains from 8 to 12 weight percent methacrylic acid or acrylic acid.
Claim 10
Dependent Claim
14 words
The polymer pellets of claim 8 wherein the metal ions are zinc or sodium.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |