US3928704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing thin-walled articles from plastics
Assignee: Czech Academy of Sciences
•
Filing: 1974-06-24
•
Granted: 1975-12-23
•
Expires: 1994-06-24
Abstract
Abstract Thin-walled articles produced from plastics applied to a fabric support or prepared without a fabric support by casting, coating or dipping, particularly plastic leathers with improved hygienic properties, such as permeability for air, water vapors and absorption of moisture. A hydrophilic filler or mixture of such fillers, together with a liquid or mixture of liquids which cause the filler to swell and which act as a physical blowing agent above their b.p. (60* - 140*C), are added to the processed material. The processed material may be based on poly(vinyl chloride), vinyl chloride copolymers or their mixtures, containing the usual plasticizers, stabilizers, lubricants, pigments and other additives. The filler is based upon synthetic cross-linked water-insoluble macromolecular compounds capable of reversibly binding water due to their polar groups, as for example, hydroxyl, amide, carboxyl, sulfohydroxyl or quaternary ammonium groups.
Inventors
- 👤 Viktor Heidingsfeld
- 👤 Slavko Hudecek
- 👤 Jaroslav Hnidek
- 👤 Jan Kolarik
- 👤 Jiri Zelinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:14
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/0056; D06N3/0061; C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L33/00; C08L33/02; D06N2205/00; D06N2205/08; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10S521/00; Y10S521/905; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T442/00; Y10T442/20; Y10T442/2139; Y10T442/2762; Y10T442/2861
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A THIN-WALLED PLASTIC ARTICLE COMPRISING A UNIFORM BLEND OF AN ADMIXTURE OF AT LEAST ONE HYDROPHILIC FILLER BASED ON A SYNTHETIC CROSS-LINKED WATER-INSOLUBLE MACRO-MOLECULAR COMPOUND CONTAINING POLAR GROUPS CAPABLE OF BINDING WATER REVERSIBLY, AT LEAST ONE LIQUID BOILING IN THE RANGE OF 60* TO 140*C AND EFFECTIVE TO SWELL SAID HYDROPHILIC FILLER SELECTED FROM THE GROUP OF WATER AND LOWER ALIPHATIC ALCOHOLS, AND A VINYL CHLORIDE PLASTISOL TYPE RESIN MATERIAL SELECTED FROM THE GROUP OF POLYVINYLCHLORIDE, COPOLYMERS OF VINYL CHLORID AND MIXTURES THEREOF, SAID LIQUID BEING IN AN AMOUNT OF AT LEAST 10% BY WEIGHT REFERRED TO THE HYDROPHILIC FILLER, SAID BLEND BEING FORMED INTO AN EXPANDED JELL AND SET INTO A PREDETERMINED SHAPE.
Claim 2
Dependent Claim
113 words
A thin walled plastic article comprising a laminate formed of at least one layer of fabric and at least one layer of an expanded jell composition formed of a uniform blend of an admixture of at least one hydrophilic filler based on a synthetic crosslinked water-insoluble macromolecular compound containing polar groups capable of binding water reversibly, at effective to swell said hydrophilic filler selected from the group of water and lower aliphatic alcohols, and a vinyl chloride plastisol type resin material selected from the group of polyvinylchloride, copolymers of vinyl chloride and mixtures thereof, wherein said liquid is used in an amount of at least 10% by weight referred to the hydrophilic filler.
Claim 3
Dependent Claim
15 words
The article according to claim 2 wherein said jell is set into a predetermined shape.
Claim 4
Dependent Claim
143 words
Method for making a thin-walled plastic article comprising admixing at least one hydrophilic filler based on a synthetic cross-linked water-insoluble macromolecular compound containing polar groups capable of binding water reversibly, at least one liquid boiling in the range of from 60* to 140*C and effective to swell said hydrophilic filler selected from the group of water and lower aliphatic alcohols, and a vinyl chloride plastisol type resin material selected from the group of polyvinylchloride, copolymers of vinyl chloride and mixtures thereof, wherein said liquid is used in an amount of at least 10% by weight compared to the hydrophilic filler, to form a uniform blend thereof, applying said blend onto at least one layer of fabric to form a laminate, heating said laminate to expand the material forming said blend and heating said laminate to cause jelling of said material forming said blend.
Claim 5
Dependent Claim
24 words
The method according to claim 4 which comprises carrying out said expansion by heating said laminate to a temperature of from 80* to 100*C.
Claim 6
Dependent Claim
24 words
The method according to claim 4 which comprises carrying out said jelling by heating said laminate to a temperature of from 170* to 190*C.
Claim 7
Dependent Claim
50 words
The method according to claim 4 wherein said hydrophilic filler is based on a synthetic cross-linked water insoluble macromolecular compound containing hydroxyl, amide, carboxyl or sulfohydroxyl groups in H , Na , Li , Ca , or Ba form or quaternary ammonium groups in OH , Cl or SO4H form.
Claim 8
Dependent Claim
26 words
The method according to claim 4 wherein said liquid is first mixed with said filler and the resulting mixture admixed with said vinylchloride plastisol resin material.
Claim 9
Dependent Claim
27 words
The method according to claim 4 wherein said hydrophilic filler is used in an amount of 5 to 50% by weight of the total of said blend.
Claim 10
Dependent Claim
27 words
The method according to claim 4 wherein said vinylchloride plastisol resin material additionally contains at least one member of the group of plasticizers, stabilizers, lubricants and pigments.
Claim 11
Dependent Claim
19 words
The method according to claim 4 wherein said liquid is a mixture of water and a lower aliphatic alcohol.
Claim 12
Dependent Claim
13 words
The method according to claim 4 wherein said liquid comprises an azEotropic mixture.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |