US4579900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric composition useful for hot water pipe service
Assignee: Shell USA Inc
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Filing: 1985-03-27
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Granted: 1986-04-01
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Expires: 2005-03-27
Abstract
Abstract District heating pipes for potable water contain a polymer composition which comprises a butene-1 homopolymer, sterically hindered phenolic antioxidant, lauryl-stearyl thiodipropionate, nucleating agent, mineral filler coated with acid acceptor and pigment.
Inventors
- 👤 Ananda M. Chatterjee
- 👤 Earl E. Hayden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:42
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/134; C08K5/1345; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
101 words
District heating pipes for potable water which contain a polymeric composition consisting essentially of an intimate blend of: (a) about 93 to about 98 percent by weight of an isotactic butene-1 homopolymer; (b) about 0.05 to about 0.5 percent by weight of Bis-[3,3-bis(4'-hydroxy-3'tert.butyl-phenyl)-butanoic acid]-glycolester antioxidant; (c) about 0.2 to about 0.7 percent by weight of lauryl-stearyl thiodipropionate; (d) about 0.02 to about 0.6 percent by weight of a nucleating agent; (e) about 0.5 to about 3.0 percent by weight of filler component comprising a mineral filler coated with an acid acceptor; and (f) zero to about 3.0 percent by weight pigment.
Claim 2
Dependent Claim
101 words
District heating pipes for potable water which contain a polymeric composition consisting essentially of an intimate blend of: (a) about 93 to about 98 percent by weight of an isotactic butene-1 homopolymer; (b) about 0.05 to about 0.5 percent by weight of Bis-[3,3-bis(4'-hydroxy-3'tert.butyl-phenyl)-butanoic acid]-glycolester antioxidant; (c) about 0.2 to about 0.7 percent by weight of lauryl-stearyl thiodipropionate; (d) about 0.02 to about 0.6 percent by weight of a nucleating agent; (e) about 0.5 to about 3.0 percent by weight of filler component comprising a mineral filler coated with an acid acceptor; and (f) zero to about 3.0 percent by weight pigment.
Claim 3
Dependent Claim
19 words
The pipes according to claim 1 wherein said filler component comprises a magnesium silicate coated with a metal stearate.
Claim 4
Dependent Claim
15 words
The pipes according to claim 1 wherein said filler component is zinc stearate coated talc.
Claim 5
Dependent Claim
77 words
The pipes of claim 1 wherein the relative amounts of each component are: (a) about 95 to about 97 percent by weight butene-1 homopolymer; (b) about 0.1 to about 0.3 percent by weight antioxidant; (c) about 0.3 to about 0.5 percent by weight lauryl-stearyl thiodipropionate; (d) about 0.025 to about 0.5 percent by weight nucleating agent; (e) about 1.0 to about 3.0 percent by weight filler; and (f) about 1.0 to about 2.0 percent by weight pigment.
Claim 6
Dependent Claim
13 words
The pipes of claim 1 wherein said nucleating agent is high density polyethylene.
Claim 7
Dependent Claim
20 words
The pipes of claim 1 wherein said pigment is selected from the group consisting of titanium dioxide and carbon black.
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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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |