US4159977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing the gel and cure times for polyester-alumina trihydrate dispersions by blending therewith small quantities of activated alumina
Assignee: Alcoa Corp
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Filing: 1978-09-20
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Granted: 1979-07-03
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Expires: 1998-09-20
Abstract
Abstract An improved process for dispersing alumina trihydrate in a polyester resin is disclosed wherein the improvement comprises reducing the times required to accomplish the gelling and curing of a polyester resin by blending two to ten percent activated alumina, based on the total weight of alumina, with the alumina trihydrate.
Inventors
- 👤 Hsiun P. Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:14
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 words
In a process for making an alumina trihydrate filled polyester product comprising the steps of dispersing a polyester resin with up to 65% alumina trihydrate, based on the total weight of the resin and the trihydrate, and a catalyst, the improvement comprising reducing the time required to accomplish the gelling and subsequent curing of the polyester resin by blending from about 2.0 to 10.0 percent activated alumina, based on the total weight of alumina, with the alumina trihydrate prior to the mixing with the polyester resin, said activated alumina having a loss on ignition of less than 10.0 percent.
Claim 2
Dependent Claim
99 words
In a process for making an alumina trihydrate filled polyester product comprising the steps of dispersing a polyester resin with up to 65% alumina trihydrate, based on the total weight of the resin and the trihydrate, and a catalyst, the improvement comprising reducing the time required to accomplish the gelling and subsequent curing of the polyester resin by blending from about 2.0 to 10.0 percent activated alumina, based on the total weight of alumina, with the alumina trihydrate prior to the mixing with the polyester resin, said activated alumina having a loss on ignition of less than 10.0 percent.
Claim 3
Dependent Claim
23 words
A method as set forth in claim 1 wherein the activated alumina has a loss on ignition of from four to ten percent.
Claim 4
Dependent Claim
22 words
A method as set forth in claim 1 wherein about two to five percent activated alumina is blended with the alumina trihydrate.
Claim 5
Dependent Claim
32 words
A method as set forth in claim 1 wherein 50 to 60 percent alumina trihydrate, based on the total weight of the resin and the trihydrate, is dispersed with the polyester resin.
Claim 6
Dependent Claim
88 words
An improved alumina trihydrate polyester resin dispersion comprising: 40 to 50 percent polyester resin, based on the total weight of the resin and the trihydrate; 50 to 60 percent alumina trihydrate, based on the total weight of the resin and trihydrate with from about two to ten percent of said alumina trihydrate, based on the total weight of alumina, activated to a loss on ignition of less than ten percent; and up to two percent of a catalyst, based on the total weight of the resin and trihydrate.
Claim 7
Dependent Claim
88 words
An improved alumina trihydrate polyester resin dispersion comprising: 40 to 50 percent polyester resin, based on the total weight of the resin and the trihydrate; 50 to 60 percent alumina trihydrate, based on the total weight of the resin and trihydrate with from about two to ten percent of said alumina trihydrate, based on the total weight of alumina, activated to a loss on ignition of less than ten percent; and up to two percent of a catalyst, based on the total weight of the resin and trihydrate.
Claim 8
Dependent Claim
39 words
The dispersion as set forth in claim 5 wherein from about two to ten percent of said alumina trihydrate, based on the total weight of alumina, is activated to a loss on ignition of from four to ten percent.
Claim 9
Dependent Claim
38 words
The dispersion as set forth in claim 5 wherein from about two to five percent of said alumina trihydrate, based on the total weight of alumina, is activated to a loss on ignition of less than ten percent.
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) | 1982-07-02 | 1983-01-01 | 1983-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-02 | 1987-01-01 | 1987-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-02 | 1991-01-01 | 1991-07-03 | $7700.00 | Window Closed / Lapsed |