US4665102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefin particles and process for preparing the same
Assignee: Kanegafuchi Chemical Industry Co Ltd
•
Filing: 1986-05-05
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Granted: 1987-05-12
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Expires: 2006-05-05
Abstract
Abstract Polyolefin particles having a halogenated surface region, which are prepared by irradiating ultraviolet rays to an aqueous dispersion of polyolefin particles in the presence of a halogen gas. The polyolefin particles having a halogenated surface region have an improved property of retaining volatile blowing agents and can provide expandable particles having an improved storability in the open state.
Inventors
- 👤 Masao Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:46
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20; Y; Y10; Y10S; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
52 words
A process for preparing polyolefin particles which comprises dispersing polyolefin particles in water, and irradiating ultraviolet rays to said particles in the presence of a halogen gas, thereby halogenating the surface region of said particles and wherein a volatile blowing agent is impregnated into the polyolefin particles either before or after halogenation.
Claim 2
Dependent Claim
52 words
A process for preparing polyolefin particles which comprises dispersing polyolefin particles in water, and irradiating ultraviolet rays to said particles in the presence of a halogen gas, thereby halogenating the surface region of said particles and wherein a volatile blowing agent is impregnated into the polyolefin particles either before or after halogenation.
Claim 3
Dependent Claim
18 words
The process of claim 1, wherein said imregnating is conducted after halogenating the surface region of the particles.
Claim 4
Dependent Claim
24 words
The process of claim 1, wherein said impregnating is conducted after dispersing the particles in water and before irradiating ultraviolet rays to the particles.
Claim 5
Dependent Claim
9 words
The product obtained by the process of claim 1.
References Cited (Backward Citations)
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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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |