Patent US4801640A successfully refreshed from Google Patents.
US4801640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester film having improved abrasion resistance manufactured from particle-filled polyester having nucleating agent dispersed therein
Assignee: Hoechst AG
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Filing: 1986-01-09
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Granted: 1989-01-31
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Expires: 2006-01-09
Abstract
Abstract The invention concerns a polyester film with improved abrasion resistance, dimensional stability, drawability and slip properties. The film is characterized by the fact that it contains 0.005 to 5.0% by weight of organic, preferably hardened or crosslinked, particles with narrow particle size distribution in a range between 0.01 and 5 microns, as well as a nucleating agent in an amount from 0.01 to 10% by weight, both values related to the weight of the polymers which form the film.
Inventors
- 👤 Hermann Dallmann
- 👤 Werner Schaefer
- 👤 Wolfgang Gawrisch
- 👤 Hartmut Hensel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:00
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L67/00; C08L67/02; C08J2367/00; C08J2367/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
131 words
An abrasion-resistant polyester film manufactured from a composition comprising a polyester chemically modified with from 0.005 to 5.0 percent by weight, based upon the total weight of said composition, of crosslinked organic particles covalently bonded to and substantially homogeneously distributed throughout said polyester, said particles having a grain size distribution of from 0.01 to 5.0 microns, wherein the quotient of the weight average particle diameter and the number average particle diameter is 1.1 or less, said chemically-modified polyester additionally containing from 0.01 to 10.0 percent, based upon the weight of the polyester, of a nucleating agent selected from the group consisting of alkali metal salts of ester waxes, alkaline earth salts of ester waxes, alkali metal salts of partially saponified ester waxes and alkaline earth salts of partially saponified ester waxes.
Claim 2
Dependent Claim
131 words
An abrasion-resistant polyester film manufactured from a composition comprising a polyester chemically modified with from 0.005 to 5.0 percent by weight, based upon the total weight of said composition, of crosslinked organic particles covalently bonded to and substantially homogeneously distributed throughout said polyester, said particles having a grain size distribution of from 0.01 to 5.0 microns, wherein the quotient of the weight average particle diameter and the number average particle diameter is 1.1 or less, said chemically-modified polyester additionally containing from 0.01 to 10.0 percent, based upon the weight of the polyester, of a nucleating agent selected from the group consisting of alkali metal salts of ester waxes, alkaline earth salts of ester waxes, alkali metal salts of partially saponified ester waxes and alkaline earth salts of partially saponified ester waxes.
Claim 3
Dependent Claim
51 words
The film of claim 1 wherein said polyester is chemically modifed with from 0.02 to 3.0 percent by weight, based upon the total weight of said composition, of said cross-linked organic particles having a grain size distribution of from 0.02 to 3.0 microns; and wherein said nucleating agent is sodium montanate.
Claim 4
Dependent Claim
31 words
The film of claim 1 wherein said organic particles are based on a resin selected from the group consisting of melamine/formaldehyde resin, benzoguanamine/formaldehyde resin, phenol/formaldehyde, an epoxy resin and an acrylate.
Claim 5
Dependent Claim
15 words
The film of claim 3 wherein said organic particles are based on an epoxy resin.
Claim 6
Dependent Claim
14 words
The film of claim 3 wherein said organic particles are based on an acrylate.
Claim 7
Dependent Claim
22 words
The film of claim 3 wherein said organic particles are cross-linked and have been prepared using divinyl benzene as a crosslinking agent.
Claim 8
Dependent Claim
22 words
The film of claim 3 wherein said organic particles are cross-linked and have been prepared using diallyl phthalate as a crosslinking agent.
Claim 9
Dependent Claim
30 words
The film of claim 6 wherein said organic particles have been prepared using at least one component selected from the group consisting of hydroxyethyl methacrylate, acrylic acid, and methacrylic acid.
Claim 10
Dependent Claim
30 words
The film of claim 7 wherein said organic particles have been prepared from at least one component selected from the group consisting of hydroxyethyl methacrylate, acrylic acid, and methacrylic acid.
Claim 11
Dependent Claim
29 words
The film of claim 1 wherein said polyester film is manufactured from homo- or copolycondensates of terephthalic acid or isophthalic acids with glycols having 2 to 10 carbon atoms.
Claim 12
Dependent Claim
14 words
The film of claim 1 wherein said polyester film is manufactured from polyethylene terephthalate.
Claim 13
Dependent Claim
16 words
The film of claim 1 wherein said organic particles are prepared via emulsion or suspension polymerization.
Claim 14
Dependent Claim
14 words
The film of claim 1 wherein said polyester comprises at least two different polyesters.
Claim 15
Dependent Claim
31 words
The film of claim 1 further comprising at least one other thermoplastic polymer selected from the group consisting of polyethylene, polypropylene, poly-4-methylpentene, ethylene vinyl acetate copolymers, polyamides, polycarbonates, polysulfones, and polytetrafluoroethylene.
Claim 16
Dependent Claim
28 words
The film of claim 1 further comprising one or more inorganic particles selected from the group consisting of calcium carbonate, silicon dioxide, kaolin, barium sulfate, and titanium dioxide.
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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) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |