US3692736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester resin granulates and process for preparation of same
Assignee: RESINES ET DISPERSIONS REDIS
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Filing: 1970-08-17
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Granted: 1972-09-19
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Expires: 1990-08-17
Abstract
Abstract Free-flowing, non-tacky polyester resin compositions for use in molding and a method for the preparation of same wherein a polyester resin, a monomer, reinforcing fibers, an initiator, a thickener and a charge filler are mixed in at least four stages wherein at least the polyester resin, the monomer, the reinforcing fibers, the initiator and the charge filler are mixed in a first stage at ambient temperatures, the balance of the components are added and the resulting mixture mixed in a second stage until the composition has a dough-like consistence, the resulting composition is mixed in a third stage while cooling and the composition is mixed in a fourth stage in the presence of lamellar filler to imbed the filler in the composition whereby the composition is relatively non-tacky and free-flowing.
Inventors
- 👤 Jean-Claude Besnard
- 👤 Lylian M L Pasteur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:31
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08F; C08F283/00; C08F283/01; C08L; C08L67/00; C08L67/06; C08J2367/00; C08J2367/06; Y; Y10; Y10S; Y10S524/00; Y10S524/908
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
26 words
A process as defined in claim 1 wherein the second stage is carried out at an elevated temperature within the range of 30* to 90* C.
Claim 2
Dependent Claim
72 words
A process as defined in claim 1 wherein the first stage is carried out for a time within the range of 0.25-1 hour, the second stage is carried out for a time within the range of 0.5-2 hours, the third stage is carried out for a time within the range of 0.5-2 hours and the fourth stage is carried out for a time within the range of 5 minutes to 0.5 hour.
Claim 3
Dependent Claim
74 words
A process as defined in claim 1 wherein the polyester resin is a resin prepared by the condensation of 0.2-1 mole of at least one compound selected from the group consisting of a dicarboxylic acid and a dicarboxylic acid anhydride containing ethylenic unsaturation, 0.8-0 mole of at least one compound selected from the group consisting of dicarboxylic acid or dicarcoxylic anhydride containing no ethylenic unsaturation and one mole of at least one polyhydric alcohol.
Claim 4
Dependent Claim
37 words
A process as defined in claim 4 wherein the dicarboxylic acid or anhydride containing ethylenic unsaturation is selected from the group consisting of ethylenically unsaturated dicarboxylic acids containing four to 20 carbon atoms and their corresponding anhydrides.
Claim 5
Dependent Claim
40 words
A process as defined in claim 4 wherein the dicarboxylic acid or anhydride containing no ethylenic unsaturation is selected from the group consisting of aromatic and saturated aliphatic dicarboxylic acids containing three to 20 carbon atoms and their corresponding anhydrides.
Claim 6
Dependent Claim
26 words
A process as defined in claim 4 wherein the polyhydric alcohol is an alcohol containing two to 15 carbon atoms and two to four hydroxy groups.
Claim 7
Dependent Claim
75 words
A process as defined in claim 1 wherein said monomer is selected from the group consisting of styrol, chlorostyrene, dichlorostyrene, alpha-methylstyrene, vinyltoluene, divinylbenzene, vinyl acetate, N-vinyl pyrrolidone, vinyl adipate, methyl and vinyl adipate, 2-vinylpyridine, methyl, propyl, isopropyl, butyl, isobutyl, allyl, lauryl, stearyl, ethylene glycol, dimethylaminoethyl methacrylates or acrylates; ethylene glycol dimethacrylate; bis-phEnol dimethacrylate and diacrylate; furfuryl acrylate; acrylonitrile, diallylic phthalate, diallylic isophthalate, triallylic cyanurate; diallylic maleate and fumarate; allyl diglycolate, allyl methacrylate, allyl malonate, trimethylpropane-diallyl-ether.
Claim 8
Dependent Claim
19 words
A process as defined in claim 1 wherein the reinforcing fibers have lengths within the range of 0.1-25 mm.
Claim 9
Dependent Claim
22 words
A process as defined in claim 1 wherein the lamellar filler is selected from the group consisting of mica, talc and kaolin.
Claim 10
Dependent Claim
34 words
A process as defined in claim 1 wherein the thickener is selected from the group consisting of metal oxides of the Group II, stannous chloride, aluminum chloride, silicone tetrachloride, aluminum dioctoate and aluminum octoate.
Claim 11
Dependent Claim
28 words
A process as defined in claim 1 wherein the composition includes an additive selected from the group consisting of pigments, dyestuffs, anti-U.V. agents, lubricants, antioxidants and mixtures thereof.
Claim 12
Dependent Claim
48 words
Free-flowing, non-tacky granulates formed of a polyester base having a flattened base and a diameter within the range of 2-5 mm., a thickness within the range of 1-3 mm. and a bulk density within the range of 0.7 - 1.8 g/cm2 prepared by the method of claim 1.
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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |