Patent US4912175A successfully refreshed from Google Patents.
US4912175A
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Process for in creasing polyamide molecular weight with P containing catalyst
Assignee: Invista North America LLC
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Filing: 1988-08-01
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Granted: 1990-03-27
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Expires: 2008-08-01
Abstract
Abstract In a process for increasing the molecular weight of a polyamide, e.g., nylon-6,6, comprising heating the polyamide in the presence of a catalyst to effect a desired molecular weight change, the improvement which comprises employing, as the catalyst, (A) R 1 (CH 2 ) n PO 3 R 2 2 and R 1 (CH 2 ) n PO 2 HR 2 where R 1 is 2-pyridyl, NHR 4 or NR 2 4 or NH 2 , n is an integer of from 2 to 5 inclusive, R 2 , being the same or different, is H or C x H 2x+1 , R 4 , being the same or different, is C x H 2x+1 , and x is an interger of from 1 to 10 inclusive; and (B) R 3 X(CH 2 ) n' PO 3 R 2 2 and R 3 X(CH 2 ) n' PO 2 HR 2 where X is S or O, n' is an integer of from 2 to 5 inclusive, R 3 is H or C x H 2x+1 , x is an integer of from 0 to 10 inclusive and R 2 is defined as in formula (A).
Inventors
- 👤 Robert C. Wheland
- 👤 Ivan K. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:24
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/28; C08G69/04
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
202 words
In a process for increasing the molecular weight of a polyamide, comprising heating the polyamide in the presence of a catalyst to effect a desired increase in molecular weight, the improvement, wherein the catalyst is at least one compound of the formulae: (A) R a CH 2 ) n PO 3 R 2 b or R a (CH 2 ) n PO 2 HR b where R a is 2-pyridyl, NHR c or NR 2 c or NH 2 , n is an integer of from 2 to 5 inclusive, R b , being the same or different, is H or C x H 2x+1 , R c , being the same or different, is C x H 2x+1 , and x is an integer of from 1 to 10 inclusive; or (B) R d X(CH 2 ) n' PO 3 R 2 b or R d X(CH 2 ) n' PO 2 HR b where X is S or O, n' is an integer of from 2 to 5 inclusive, R d is H or C x H 2x+1 , x is an integer of from 0 to 10 inclusive and R 2 R b is defined as in formula (A).
Claim 2
Dependent Claim
202 words
In a process for increasing the molecular weight of a polyamide, comprising heating the polyamide in the presence of a catalyst to effect a desired increase in molecular weight, the improvement, wherein the catalyst is at least one compound of the formulae: (A) R a CH 2 ) n PO 3 R 2 b or R a (CH 2 ) n PO 2 HR b where R a is 2-pyridyl, NHR c or NR 2 c or NH 2 , n is an integer of from 2 to 5 inclusive, R b , being the same or different, is H or C x H 2x+1 , R c , being the same or different, is C x H 2x+1 , and x is an integer of from 1 to 10 inclusive; or (B) R d X(CH 2 ) n' PO 3 R 2 b or R d X(CH 2 ) n' PO 2 HR b where X is S or O, n' is an integer of from 2 to 5 inclusive, R d is H or C x H 2x+1 , x is an integer of from 0 to 10 inclusive and R 2 R b is defined as in formula (A).
Claim 3
Dependent Claim
30 words
A process according to claim 1, wherein the catalyst is of the formula R 1 (CH 2 ) n PO 3 R 2 b , and R 1 represents 2-pyridyl.
Claim 4
Dependent Claim
24 words
A process according to claim 2, wherein R 6 is H, CH 3 , C 2 H 5 or n-C 3 H 7 .
Claim 5
Dependent Claim
16 words
A process according to claim 2, wherein R a represents 2-pyridyl and R 6 represents H.
Claim 6
Dependent Claim
11 words
A process according to claim 2, wherein R b represents methyl.
Claim 7
Dependent Claim
11 words
A process according to claim 2, wherein R b represents ethyl.
Claim 8
Dependent Claim
11 words
A process according to claim 2, wherein R b represents n-propyl.
Claim 9
Dependent Claim
10 words
A process according to claim 3, wherein n is 2.
Claim 10
Dependent Claim
14 words
A process according to claim 1, wherein the catalyst is of the formula (B).
Claim 11
Dependent Claim
24 words
A process according to claim 9, wherein R d represents methyl or ethyl, X is S, and R b is H, methyl or ethyl.
Claim 12
Dependent Claim
19 words
A process according to claim 9, wherein R d is H, X is O, and R b is H.
Claim 13
Dependent Claim
18 words
A process according to claim 10, wherein R d is methyl or ethyl and R b is H.
Claim 14
Dependent Claim
18 words
A process according to claim 10, wherein R d is methyl and R b is methyl or ethyl.
Claim 15
Dependent Claim
29 words
A process according to claim 1, wherein the catalyst is 2-(2'-pyridl)ethylphosphonic acid, 3-(2'-pyridyl)propyl-phosphonic acid, 4-(2'-pyridyl)butylphosphonic acid, 5-(2'-pyridyl)amylphosphonic acid, 3-(methylthio)propylphosphonic acid, 3-(ethylthio)propylphosphonic acid, 2-aminoethylphosphonic acid, ethyl 2-(2'-pyridyl)ethylphosphonate or 3-hydroxypropylphosphinic acid.
Claim 16
Dependent Claim
12 words
A process according to claim 1, wherein the catalyst is 2-(2'-pyridyl)ethylphosphonic acid.
Claim 17
Dependent Claim
29 words
A process according to claim 1, wherein the catalyst is R d X(CH 2 ) n' PO 2 HR b wherein R d is H and X is O.
Claim 18
Dependent Claim
12 words
A process according to claim 1, wherein the catalyst is 3-hydroxypropylphosphinic acid
Claim 19
Dependent Claim
12 words
A process according to claim 1, wherein the polyamide is a nylon.
Claim 20
Dependent Claim
17 words
A process according to claim 1, wherein the polyamide is nylon-6,6 or nylon-6 or a blend thereof.
Claim 21
Dependent Claim
11 words
A process according to claim 2, wherein the polyamide is nylon-6,6.
Claim 22
Dependent Claim
11 words
A process according to claim 14, wherein the polyamide is nylon-6,6.
Claim 23
Dependent Claim
11 words
A process according to claim 15, wherein the polyamide is nylon-6,6.
Claim 24
Dependent Claim
11 words
A process according to claim 16, wherein the polyamide is nylon-6,6.
Claim 25
Dependent Claim
11 words
A process according to claim 17, wherein the polyamide is nylon-6,6.
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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) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |