US3908069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated particulate vinyl aromatic polymers
Assignee: Shell USA Inc
•
Filing: 1974-03-29
•
Granted: 1975-09-23
•
Expires: 1994-03-29
Abstract
Abstract Expandable particles of a polymer of a vinyl aromatic compound coated with certain straight chain aliphatic substituted 1hydroxyethyl imidazolines and a process for their preparation are disclosed.
Inventors
- 👤 Leslie A Muirhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:44
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/224; C08J2325/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
44 words
COATED UNEXPANDED EXPANDABLE PARTICLES OF A POLYMER OF A VINYL AROMATIC COMPOUND IN WHICH THE COATING IS A STRAIGHT CHAIN ALIPHATIC SUBSTITUTED 1-HYDROXYETHYLIMIDAZOLINE IN AN AMOUNT SUFFICIENT TO RENDER THE PARTICLES FREE FLOWING AND HAVING REDUCED TENDENCY TO AGGLOMERATE BEFORE, DURING AND AFTER PREEXPANSION.
Claim 2
Dependent Claim
44 words
COATED UNEXPANDED EXPANDABLE PARTICLES OF A POLYMER OF A VINYL AROMATIC COMPOUND IN WHICH THE COATING IS A STRAIGHT CHAIN ALIPHATIC SUBSTITUTED 1-HYDROXYETHYLIMIDAZOLINE IN AN AMOUNT SUFFICIENT TO RENDER THE PARTICLES FREE FLOWING AND HAVING REDUCED TENDENCY TO AGGLOMERATE BEFORE, DURING AND AFTER PREEXPANSION.
Claim 3
Dependent Claim
14 words
Coated expandable particles as in claim 1 in which the coating comprises a 1hydroxyethyl-2-alkylimidazoline.
Claim 4
Dependent Claim
28 words
Coated expandable particles as in claim 2 in which the alkyl group contains an odd number of carbon atoms in the range from about C11 to about C21.
Claim 5
Dependent Claim
29 words
Coated expandable particles as in claim 1 wherein the coating contains a surfactant and the ratio of said imidazoline to surfactant is in the range from 1:2 to 4:1.
Claim 6
Dependent Claim
12 words
Coated expandable particles as in claim 4 wherein the surfactant is nonionic.
Claim 7
Dependent Claim
30 words
Coated expandable particles as in claim 1 wherein the coating is present in an amount in the range from about 0.01 to about 1.0% by weight of the expandable particles.
Claim 8
Dependent Claim
51 words
A process for the manufacture of free flowing coated unexpanded expandable particles of a vinyl aromatic polymer which comprises contacting unexpanded expandable particles of a polymer of a vinyl aromatic compound with a solution of a straight chain aliphatic substituted 1-hydroxyethyl imidazoline in a non-aqueous vaporizable solvent, and evaporating the solvent.
Claim 9
Dependent Claim
51 words
A process for the manufacture of free flowing coated unexpanded expandable particles of a vinyl aromatic polymer which comprises contacting unexpanded expandable particles of a polymer of a vinyl aromatic compound with a solution of a straight chain aliphatic substituted 1-hydroxyethyl imidazoline in a non-aqueous vaporizable solvent, and evaporating the solvent.
Claim 10
Dependent Claim
31 words
A process as in claim 7 wherein in step (a) the solution contains a surfactant and the ratio of said imidazoline to surfactant is in the range from 1:1 to 4:1.
Claim 11
Dependent Claim
15 words
A process as in claim 7 wherein the solvent is at least one lower alcohol.
References Cited (Backward Citations)
US3304274A
Cited
US3461088A
Cited
US3553114A
Cited
US3627713A
Cited
US3817879A
Cited
US3853453A
Cited
US3793242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |