Patent US4373543A successfully refreshed from Google Patents.
Patent US4359492A successfully refreshed from Google Patents.
US4359492A
Expired / Lapsed
US
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Coating with dusting agents in pelletizing tacky elastomeric materials
Assignee: Lyondell Chemical Technology LP
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Filing: 1981-03-13
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Granted: 1982-11-16
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Expires: 2001-03-13
Abstract
Abstract Thermoplastic elastomers useful in formulating certain pressure-sensitive hot-melt adhesives are normally very tacky and thus are hard to handle. The present invention relates to a method of eliminating problems due to this tackiness by dusting the elastomer pellets with a friable polymer resin having a ring and ball softening point of at least 95° C. Selection of a polymer resin which is normally used in adhesive formulations allows one to overcome tackiness without having detrimental effects on the ultimate adhesive properties of formulations based on the elastomer.
Inventors
- 👤 James A. Schlademan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:46
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; C08J2321/00; Y; Y10; Y10S; Y10S83/00; Y10S83/922
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
A method of preparing free-flowing elastomeric polymer pellets consisting essentially of coating the surface of a strand of normally tacky elastomeric polymer with up to 2% by weight of a dusting agent and then cutting the strands into pellets; said dusting agent consisting of a friable polymer having a ball and ring softening point of at least 95° C. and normally used in compounding of adhesives based on said elastomeric polymer, whereby the dusting agent does not interfere with the normal use of the pellets in adhesive formulations.
Claim 2
Independent Claim
88 words
A method of preparing free-flowing elastomeric polymer pellets consisting essentially of coating the surface of a strand of normally tacky elastomeric polymer with up to 2% by weight of a dusting agent and then cutting the strands into pellets; said dusting agent consisting of a friable polymer having a ball and ring softening point of at least 95° C. and normally used in compounding of adhesives based on said elastomeric polymer, whereby the dusting agent does not interfere with the normal use of the pellets in adhesive formulations.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein the friable polymer is a tackifier resin selected from the group consisting of rosin, rosin derivatives, polyterpene resins and aliphatic hydrocarbon resins.
Claim 4
Dependent Claim
44 words
The method of claim 1 wherein the friable polymer is a reinforcing resin selected from the group consisting of aromatic hydrocarbon resins, low molecular weight resinous polymers of vinyltoluene, α-methylstyrene, styrene, indene and copolymers of these with each other and with other polymerizable comonomers.
References Cited (Backward Citations)
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UST982004I4
Cited
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Cited
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Cited
US4101484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |