US4252705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance of polyvinyl chloride resins to discoloration during drying with N,N'-diphenyl urea
Assignee: Argus Chemical Corp
•
Filing: 1978-12-26
•
Granted: 1981-02-24
•
Expires: 1998-12-26
Abstract
Abstract The resistance of polyvinyl chloride resins to the development of yellow to orange reversible discoloration when heated in the presence of water at moderately elevated temperatures above 80° C. up to about 160° C. is improved by combining therewith an N,N'-diphenyl urea. Such reversible discoloration is not associated with any heat instability, and the resistance of the polyvinyl chloride resin to deterioration when heated at processing temperatures of 150° C. and above is then improved by incorporation of the usual polyvinyl chloride resin heat stabilizers.
Inventors
- 👤 Lawrence R. Brecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:24
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/21
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
88 words
A process for inhibiting the development of a yellow to orange discoloration by polyvinyl chloride polymers when heated in the presence of water at a temperature within the range from about 80° to about 200° C., which comprises mixing an N,N'-diphenyl urea with the polymer in an amount within the range from about 0.005 to about 10 parts by weight per 100 parts of polymer and then heating the polyvinyl chloride polymer in the presence of water at a temperature above 80° C. up to about 200° C.
Claim 2
Dependent Claim
88 words
A process for inhibiting the development of a yellow to orange discoloration by polyvinyl chloride polymers when heated in the presence of water at a temperature within the range from about 80° to about 200° C., which comprises mixing an N,N'-diphenyl urea with the polymer in an amount within the range from about 0.005 to about 10 parts by weight per 100 parts of polymer and then heating the polyvinyl chloride polymer in the presence of water at a temperature above 80° C. up to about 200° C.
Claim 3
Dependent Claim
17 words
A process according to claim 1, which includes removing water and drying the polymer during the heating.
Claim 4
Dependent Claim
11 words
A process according to claim 2, which comprises spray-drying the polymer.
Claim 5
Dependent Claim
11 words
A process according to claim 2, which comprises flash-drying the polymer.
Claim 6
Dependent Claim
11 words
A process according to claim 2, which comprises steam-stripping the polymer.
Claim 7
Dependent Claim
20 words
A process according to claim 2, in which the dried polymer is combined with a polyvinyl chloride resin heat stabilizer.
Claim 8
Dependent Claim
29 words
A process according to claim 6, in which the heat stabilizer is a salt of polyvalent metal and a ninnitrogenous organic acid having from six to twenty carbon atoms.
Claim 9
Dependent Claim
17 words
A process according to claim 7, in which the metal salt is an alkaline earth metal salt.
Claim 10
Dependent Claim
21 words
A process according to claim 6, in which the heat stabilizer is an organic compound containing at least one epoxy group.
Claim 11
Dependent Claim
15 words
A process according to claim 6, in which the heat stabilizer is an organic phosphite.
Claim 12
Dependent Claim
15 words
A process according to claim 6, in which the heat stabilizer is an organotin compound.
Claim 13
Dependent Claim
15 words
A process according to claim 1, in which the polymer is polyvinyl chloride resin homopolymer.
Claim 14
Dependent Claim
19 words
A process according to claim 1, in which the polymer is a copolymer of vinyl chloride and vinyl acetate.
Claim 15
Dependent Claim
18 words
A process according to claim 1, in which the polymer is a copolymer of vinyl chloride and ethylene.
Claim 16
Dependent Claim
25 words
A process according to claim 1, in which the polymer heated in the presence of water comprises the polymer and a plasticizer for the polymer.
Claim 17
Dependent Claim
34 words
A process according to claim 1, in which the N,N'-diphenyl urea is incorporated directly in an aqueous composition containing the polymer and a vinyl chloride monomer, which is heated to remove vinyl chloride monomer.
Claim 18
Dependent Claim
26 words
A process according to claim 16, in which the N,N'-diphenyl urea is incorporated directly in an aqueous composition containing a polyvinyl chloride emulsion polymerization reaction product.
Claim 19
Dependent Claim
31 words
A process according to claim 1, in which the N,N'-diphenyl urea is incorporated in an aqueous composition containing the polymer and a vinyl chloride monomer before polymerization to form polyvinyl chloride.
Claim 20
Dependent Claim
26 words
A process according to claim 1, in which the N,N'-diphenyl urea is incorporated directly in an aqueous composition containing a polyvinyl chloride suspension polymerization reaction product.
Claim 21
Dependent Claim
24 words
A process according to claim 19 in which the aqueous composition has a pH within the range of from about 3 to about 11.
Claim 22
Dependent Claim
14 words
A process according to claim 1 in which the N,N'-diphenyl urea is N,N'-diphenyl urea.
Claim 23
Dependent Claim
53 words
A process according to claim 1, in which the N,N'-diphenyl urea has the formula: ##STR8## wherein: R 1 and R 2 are selected from the group consisting of halogen, alkyl, cycloalkyl, and alkoxy of from one to about twenty carbon atoms; and n 1 and n 2 are integers from zero to five.
Claim 24
Dependent Claim
18 words
A process according to claim 22 in which R 1 and R 2 are in the para position.
Claim 25
Dependent Claim
16 words
A process according to claim 22 in which n 1 and n 2 are each one.
Claim 26
Dependent Claim
12 words
A polyvinyl chloride polymer prepared according to the process of claim 1.
Claim 27
Dependent Claim
55 words
An aqueous polyvinyl chloride polymer composition having a tendency to develop a yellow to orange discoloration when heated at a temperature within the range from about 80° to about 160° C., comprising water and polyvinyl chloride polymer, and an N,N'-diphenyl urea in an amount sufficient to inhibit the development of such discoloration at such temperatures.
Claim 28
Dependent Claim
55 words
An aqueous polyvinyl chloride polymer composition having a tendency to develop a yellow to orange discoloration when heated at a temperature within the range from about 80° to about 160° C., comprising water and polyvinyl chloride polymer, and an N,N'-diphenyl urea in an amount sufficient to inhibit the development of such discoloration at such temperatures.
Claim 29
Dependent Claim
22 words
An aqueous polyvinyl chloride polymer composition according to claim 26 in which the composition is a polyvinyl chloride emulsion polymerization reaction product.
Claim 30
Dependent Claim
23 words
An aqueous polyvinyl chloride polymer composition according to claim 26 in which the aqueous composition is a polyvinyl chloride suspension polymerization reaction product.
Claim 31
Dependent Claim
27 words
An aqueous polyvinyl chloride polymer composition according to claim 26 in which the aqueous composition has a pH within the range from about 3 to about 11.
Claim 32
Dependent Claim
18 words
An aqueous polyvinyl chloride polymer composition according to claim 26 in which the polymer is vinyl chloride homopolymer.
Claim 33
Dependent Claim
23 words
An aqueous polyvinyl chloride polymer composition according to claim 26 in which the polymer is a copolymer of vinyl chloride and vinyl acetate.
Claim 34
Dependent Claim
22 words
An aqueous polyvinyl chloride polymer composition according to claim 26 in which the polymer is a copolymer of vinyl chloride and ethylene.
Claim 35
Dependent Claim
29 words
An aqueous polyvinyl chloride polymer composition according to claim 26 in which the polymer heated in the presence of water comprises the polymer and a plasticizer for the polymer.
Claim 36
Dependent Claim
18 words
An aqueous polyvinyl chloride polymer composition according to claim 26 in which the N,N'-diphenyl urea is N,N'-diphenyl urea.
Claim 37
Dependent Claim
57 words
An aqueous polyvinyl chloride polymer composition according to claim 26 in which the N,N'-diphenyl urea has the formula: ##STR9## wherein: R 1 and R 2 are selected from the group consisting of halogen, alkyl, cycloalkyl, and alkoxy of from one to about twenty carbon atoms; and n 1 and n 2 are integers from zero to five.
Claim 38
Dependent Claim
22 words
An aqueous polyvinyl chloride polymer composition according to claim 35 in which R 1 and R 2 are in the para position.
Claim 39
Dependent Claim
20 words
An aqueous polyvinyl chloride polymer composition according to claim 35 in which n 1 and n 2 are each one.
Claim 40
Dependent Claim
29 words
A process according to claim 1 in which the N,N'-diphenyl urea is incorporated directly in an aqueous composition containing the polymer and a vinyl chloride monomer, which is dried.
Claim 41
Dependent Claim
36 words
A process according to claim 1 in which the N,N'-diphenyl urea is incorporated directly in an aqueous composition containing the polymer and a vinyl chloride monomer, which is heated to remove vinyl chloride monomer and dried.
References Cited (Backward Citations)
US3051675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |