US4710532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical article and method
Assignee: Vertellus Performance Materials Inc
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Filing: 1986-05-22
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Granted: 1987-12-01
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Expires: 2006-05-22
Abstract
Abstract Citrate esters are formed utilizing organic titanates as a catalyst allowing excess alcohol to be removed. Four citrate esters have been found which provide advantageous plasticizing properties to PVC compositions which include superior toxicity test results and superior soapy water extraction test results. The four citrate esters are: acetyltri-n-hexyl citrate, n-butyryltri-n-hexyl citrate, acetyltri-n-(hexyl/octyl/decyl) citrate, and acetyltri-n-(octyl/decyl) citrate. Articles formed from the PVC plasticized mixtures are extremely useful in the medical or health care field as they demonstrate a low order of toxicity.
Inventors
- 👤 Ezekiel H. Hull
- 👤 Edward P. Frappier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:50
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/11
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
46 words
A polyvinyl chloride composition comprising a polyvinyl chloride resin and a plasticizing amount of N-butyryltri-N-hexyl citrate, and N-butyryltri-N-hexyl citrate having heat stability characteristics, after heating at 150° C. for two hours, of a color not greater than 50-60 apha and a mild odor at 25° C.
Claim 2
Dependent Claim
46 words
A polyvinyl chloride composition comprising a polyvinyl chloride resin and a plasticizing amount of N-butyryltri-N-hexyl citrate, and N-butyryltri-N-hexyl citrate having heat stability characteristics, after heating at 150° C. for two hours, of a color not greater than 50-60 apha and a mild odor at 25° C.
Claim 3
Dependent Claim
38 words
A polyvinyl chloride composition as claimed in claim 1 wherein said citrate has an additional heat stability characteristic, after heating at 150° C. for two hours, of a neutralization number, mg KOH/g, or not greater than about 0.2.
Claim 4
Dependent Claim
18 words
A polyvinyl chloride composition as claimed in claim 1 wherein said citrate was a low order of toxicity.
Claim 5
Dependent Claim
56 words
A medical article formed from a polyvinyl chloride composition comprising a polyvinyl chloride resin, a plasticizing amount of N-butyryltri-N-hexyl citrate, a stabilizer and a lubricant, and wherein said citrate has heat stability characteristics after heating at 150° C. for two hours, of a color not greater than 50-60 apha and a mild odor at 25° C.
Claim 6
Dependent Claim
56 words
A medical article formed from a polyvinyl chloride composition comprising a polyvinyl chloride resin, a plasticizing amount of N-butyryltri-N-hexyl citrate, a stabilizer and a lubricant, and wherein said citrate has heat stability characteristics after heating at 150° C. for two hours, of a color not greater than 50-60 apha and a mild odor at 25° C.
Claim 7
Dependent Claim
12 words
A medical article as claimed in claim 4 comprising a blood bag.
Claim 8
Dependent Claim
17 words
A medical article as claimed in claim 5 wherein said citrate has a low order of toxicity.
Claim 9
Dependent Claim
37 words
A medical article as claimed in claim 5 wherein said citrate has an additional heat stability characteristic after heating at 150° C. for two hours, of a neutralization number, mg KOH/g, of not greater than about 0.2.
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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) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |