EP0635545A2
Expired / Lapsed
EP
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Injection molded articles from extrudable polyvinyl alcohol compositions
Assignee: Air Products and Chemicals Inc
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Filing: 1994-07-19
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Granted: —
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Expires: 2014-07-19
Abstract
Abstract An article of manufacture comprising a thermoformed polyvinyl alcohol compounded with a solid plasticizer and a liquid plasticizer, the polyvinyl alcohol made melt extrudable by adding sufficient energy to the polyvinyl alcohol to both melt it and substantially eliminate the crystallinity in the melt while simultaneously removing energy from the melt at a rate sufficient avoid decomposition of the polyvinyl alcohol and the solid plasticizer being sorbitol, mannitol, pentaerythritol and/or dipentaerythritol.
Inventors
- 👤 Amir Famili
- 👤 Finn Lennart Marten
- 👤 James Francis Nangeroni
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 04:17
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0016; A; A61; A61F; A61F13/00; A61F13/15; A61F13/20; A61F13/26; C08K5/04; C08K5/05; C08K5/053
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
40 words
In a thermoformable polyvinyl alcohol composition containing plasticizer and optionally filler, the improvement which comprises 1-10 wt% solid plasticizer for the polyvinyl alcohol and 8-20 wt% liquid plasticizer for the polyvinyl alcohol, the amount of plasticizers based on polyvinyl alcohol.
Claim 2
Dependent Claim
11 words
The composition of Claim 1 which contains 3-8 wt% solid plasticizer.
Claim 3
Dependent Claim
12 words
The composition of Claim 1 which contains about 5 wt% solid plasticizer.
Claim 4
Dependent Claim
24 words
The composition of Claim 1 in which the solid plasticizer is selected from the group consisting of sorbitol, mannitol, pentaerythritol, dipentaerythritol and mixtures thereof.
Claim 5
Dependent Claim
130 words
A thermoformable composition which consists essentially of (a) a thermoplastic polyvinyl alcohol, the polyvinyl alcohol made melt extrudable by adding to the polyvinyl alcohol at least 0.27 KW hr/kg of polyvinyl alcohol to both melt it and substantially eliminate the crystallinity in the melt while simultaneously removing energy from the melt at a rate sufficient avoid decomposition of the polyvinyl alcohol, (b) 1-10 wt% solid plasticizer for the polyvinyl alcohol, the solid plasticizer being selected from the group consisting of sorbitol, mannitol, pentaerythritol, dipentaerythritol and mixtures thereof, (c) 8-20 wt% liquid plasticizer for the polyvinyl alcohol, the liquid plasticizer being selected from the group consisting of glycerol, ethylene glycol, polyethylene glycol and mixtures thereof, and (d) 0-50 wt% filler, the amount of plasticizers and filler being based on polyvinyl alcohol.
Claim 6
Dependent Claim
11 words
The composition of Claim 5 which contains 3-8 wt% solid plasticizer.
Claim 7
Dependent Claim
12 words
The composition of Claim 5 which contains about 5 wt% solid plasticizer.
Claim 8
Dependent Claim
25 words
The composition of Claim 5 in which the liquid plasticizer is selected from the group consisting of glycerol, ethylene glycol, polyethylene glycol and mixtures thereof.
Claim 9
Dependent Claim
21 words
The composition of Claim 5 in which the thermoformable composition contains 5-30 wt% filler which is starch, clay or calcium carbonate.
Claim 10
Dependent Claim
13 words
A thin wall thermoprocessed article prepared from the thermoformable composition of Claim 5.
Claim 11
Dependent Claim
13 words
A thin wall thermoprocessed article prepared from the thermoformable composition of Claim 6.
Claim 12
Dependent Claim
13 words
A thin wall thermoprocessed article prepared from the thermoformable composition of Claim 7.
Claim 13
Dependent Claim
13 words
A thin wall thermoprocessed article prepared from the thermoformable composition of Claim 8.
Claim 14
Dependent Claim
13 words
A thin wall thermoprocessed article prepared from the thermoformable composition of Claim 9.
Claim 15
Dependent Claim
17 words
The article of Claim 10 which is a tampon applicator comprising at least one elongated tubular member.
Claim 16
Dependent Claim
26 words
The article of Claim 15 in which the applicator comprises a pair of telescoping tubes, at least one of which is prepared from the thermoformable composition.
Claim 17
Dependent Claim
108 words
In a water-dispersible insertion device for tampons and the like comprising at least one thin walled tubular member in which the walls are comprised of a thermoformed, water soluble polyvinyl alcohol compounded with a plasticizer, the improvement which comprises the polyvinyl alcohol made melt extrudable by adding to the polyvinyl alcohol 0.3 to 0.45 KW hr/kg to both melt it and substantially eliminate the crystallinity in the melt while simultaneously removing energy from the melt at a rate sufficient avoid decomposition of the polyvinyl alcohol, 1-10 wt% solid plasticizer being selected from the group consisting of sorbitol, mannitol, pentaerythritol, dipentaerythritol and mixtures thereof and 8-20 wt% liquid plasticizer.
Claim 18
Dependent Claim
17 words
The insertion device of Claim 17 which further comprises 0-50 wt% starch, clay or calcium carbonate filler.
Claim 19
Dependent Claim
12 words
The insertion device of Claim 18 in which the plasticizer is pentaerythritol.
Claim 20
Dependent Claim
13 words
The insertion device of Claim 19 in which the filler is calcium carbonate.
Claim 21
Dependent Claim
86 words
In an article of manufacture comprising a thermoformed, water soluble polyvinyl alcohol compounded with a plasticizer, the improvement which comprises polyvinyl alcohol that has been made melt extrudable by adding to the polyvinyl alcohol at least 0.27 KW hr/kg to both melt it and substantially eliminate the crystallinity in the melt while simultaneously removing energy from the melt at a rate sufficient to avoid decomposition of the polyvinyl alcohol and the plasticizer being selected from the group consisting of sorbitol, mannitol, pentaerythritol, dipentaerythritol and mixtures thereof.
References Cited (Backward Citations)
No citation records indexed.
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