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US4631301A
Expired / Lapsed
US
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Method for incorporating chlorpyrifos into thermoplastic resins
Assignee: Dow Chemical Japan Ltd
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Filing: 1985-02-06
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Granted: 1986-12-23
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Expires: 2005-02-06
Abstract
Abstract Novel composition and method for thermally stabilizing an O-pyridyl phosphate insecticide such as chlorpyrifos. The insecticide is mixed with a phthalate ester prior to its incorporation into a thermoplastic resin, such as polyvinyl chloride.
Inventors
- 👤 Jiro Kozuma
- 👤 Hirohiko Hamaguchi
- 👤 Tetsuya Shibahara
- 👤 Joseph P. Strasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:32
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; A; A01; A01N; A01N25/00; A01N25/22; A01N57/00; A01N57/10; A01N57/16; C08K5/0008; C08K5/0058
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
A method for thermally stabilizing an O-pyridyl phosphate compound of the formula ##STR4## wherein R represents halopyridyl, Z is oxygen or sulphur, and each R 1 is loweralkyoxy, amino or loweralkylamino, comprising (a) mixing said O-pyridyl phosphate with a phthalate ester of the formula ##STR5## wherein Y is alkyl from about 2 to about 20 carbon atoms or ##STR6## wherein Y 1 is alkyl from about 1 to about 20 carbon atoms, and Y 2 is hydrogen or methyl; said O-pyridyl phosphate and said phthalate ester being present in proportions effective to prevent appreciable ecomposition of said O-pyridyl phosphate upon heating said mixture, and (b) incorporating said mixture into a thermoplastic resin heated to a temperature which would decompose the O-pyridyl phosphate compound if the O-pyridyl phosphate were heated alone.
Claim 2
Independent Claim
130 words
A method for thermally stabilizing an O-pyridyl phosphate compound of the formula ##STR4## wherein R represents halopyridyl, Z is oxygen or sulphur, and each R 1 is loweralkyoxy, amino or loweralkylamino, comprising (a) mixing said O-pyridyl phosphate with a phthalate ester of the formula ##STR5## wherein Y is alkyl from about 2 to about 20 carbon atoms or ##STR6## wherein Y 1 is alkyl from about 1 to about 20 carbon atoms, and Y 2 is hydrogen or methyl; said O-pyridyl phosphate and said phthalate ester being present in proportions effective to prevent appreciable ecomposition of said O-pyridyl phosphate upon heating said mixture, and (b) incorporating said mixture into a thermoplastic resin heated to a temperature which would decompose the O-pyridyl phosphate compound if the O-pyridyl phosphate were heated alone.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said O-pyridyl phosphate is chlorpyrifos.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein said phthalate ester is dioctyl phthalate.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein said O-pyridyl phosphate is chlorpyrifos and said phthalate ester is dioctyl phthalate.
Claim 6
Dependent Claim
26 words
The method of claim 1 wherein said thermoplastic resin is selected from the group consisting of polyvinyl chloride, polystyrene, acrylonitrile, methacrylate ester, polyethylene and combinations thereof.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein said thermoplastic resin is polyvinyl chloride.
Claim 8
Dependent Claim
24 words
The method of claim 1 wherein said O-pyridyl phosphate is chlorpyrifos, said phthalate ester is dioctyl phthalate and said thermoplastic resin is polyvinyl chloride.
Claim 9
Dependent Claim
16 words
The method of claim 1 wherein said steps of mixing and incorporating are performed by kneading.
Claim 10
Dependent Claim
15 words
The method of claim 1 further comprising (c) pelleting the resin containing said O-pyridyl phosphate.
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) | 1989-12-22 | 1990-06-23 | 1990-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-22 | 1994-06-23 | 1994-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-22 | 1998-06-23 | 1998-12-23 | $7700.00 | Window Closed / Lapsed |