US4122047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyester foam
Assignee: Individual
•
Filing: 1977-04-05
•
Granted: 1978-10-24
•
Expires: 1997-04-05
Abstract
Abstract Polyester foam is formed by simultaneously cross-linking an unsaturated polyester resin and generating carbon dioxide as a blowing agent. The foam-forming components are divided into two equal volume parts which are metered together to effect the simultaneous reactions and form the foam. Apparatus is described for effecting the foam-forming method.
Inventors
- 👤 Stanislaw Franz Filip
- 👤 Alexander Miutel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:52
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/08; B; B01; B01F; B01F35/00; B01F35/71; B01F35/717; B01F35/7174; B01F35/80; B01F35/88; B01F35/882; B01F35/8822; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/58; B29B7/60; B29B7/603; C08J2367/00; C08J2367/06; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/18; Y10S521/00; Y10S521/917
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
206 words
A method for forming a foam of a cross-linkable unsaturated water immiscible polyester resin, which comprises forming a first reaction mixture containing part of said resin, a cross-linking monomer for the resin, a carbonate material which will release carbon dioxide when contacted by acid and selected from calcium carbonate and sodium bicarbonate and a catalyst promoter for a cross-linking initiating catalyst, forming a second reaction mixture containing the remainder of said resin, a cross-linking monomer for the resin, an acid capable of reacting with said carbonate to form carbon dioxide and selected from phosphoric acid, hydrochloric acid and mixtures thereof and a cross-linking initiating catalyst which is activatable by said catalyst promoter, said resin and said cross-linkable monomer being used as a mixture characterized by the properties: ______________________________________
Brookfield viscosity (at 25° C)
about 2000 to about
3000 cps
Acid value about 25 to about 35
Monomer content about 25 to about
30 wt %,
______________________________________ and wherein said first and second reaction mixtures have substantially the same volume, and blending said first and second reaction mixtures simultaneously to cross-link said resin with said cross-linking monomer to a cured form and generate carbon dioxide as a blowing agent by reaction between said carbonate and said acid.
Claim 2
Independent Claim
206 words
A method for forming a foam of a cross-linkable unsaturated water immiscible polyester resin, which comprises forming a first reaction mixture containing part of said resin, a cross-linking monomer for the resin, a carbonate material which will release carbon dioxide when contacted by acid and selected from calcium carbonate and sodium bicarbonate and a catalyst promoter for a cross-linking initiating catalyst, forming a second reaction mixture containing the remainder of said resin, a cross-linking monomer for the resin, an acid capable of reacting with said carbonate to form carbon dioxide and selected from phosphoric acid, hydrochloric acid and mixtures thereof and a cross-linking initiating catalyst which is activatable by said catalyst promoter, said resin and said cross-linkable monomer being used as a mixture characterized by the properties: ______________________________________
Brookfield viscosity (at 25° C)
about 2000 to about
3000 cps
Acid value about 25 to about 35
Monomer content about 25 to about
30 wt %,
______________________________________ and wherein said first and second reaction mixtures have substantially the same volume, and blending said first and second reaction mixtures simultaneously to cross-link said resin with said cross-linking monomer to a cured form and generate carbon dioxide as a blowing agent by reaction between said carbonate and said acid.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein the cross-linking monomer is styrene.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said cross-linking initiating catalyst is benzoyl peroxide and said promoter is dimethylaniline.
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein said first mixture further contains resin property modifying agents, such as plasticizers, nucleation agents, fungicides and auxiliary fire retardants.
Claim 6
Dependent Claim
26 words
The method of claim 1 wherein said first and second reaction mixtures also contain a cross-linkable halogenated resin to impart fire retardant properties to the foam.
Claim 7
Dependent Claim
29 words
The method of claim 1 wherein said blending of said first and second reaction mixtures is achieved by intermixing successive incremental amounts of said first and second reaction mixtures.
Claim 8
Dependent Claim
35 words
The method of claim 1 including forming at least one opening in the cured foam, inserting a screw-thread former in said opening, curing resin in said opening and removing said former from the cured resin.
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) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |