US3844829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing thermoset polymer coated-wax impregnated cellulosic stock
Assignee: Sun Research and Development Co
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Filing: 1973-01-22
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Granted: 1974-10-29
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Expires: 1993-01-22
Abstract
Abstract Porous cellulosic stock can be coated with a thermoset polymer while being impregnated with a wax by this invention. A dispersion of solid particles of the precursor of a thermoset polymer in molten wax is applied to cellulosic stock at a temperature below the conversion temperature of the precursor. This treated cellulosic stock is then heated to a temperature above the conversion temperature of the precursor and subjected to pressure. The resulting laminated product is polymer coatedwax impregnated cellulosic stock. The solid precursor used must be substantially insoluble in the molten wax at a temperature below the conversion temperature of the precursor and must be convertible below a temperature which would degrade the stock. This product has utility as a packaging material comprising a high water vapor barrier coupled with a tough, scuff-resistant, non-blocking surface.
Inventors
- 👤 E Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:09
CPC Classifications
D; D21; D21H; D21H23/00; D21H23/02; D21H23/22; D21H23/46; D21H17/00; D21H17/60; D21H19/00; D21H19/10; D21H19/14; D21H19/18; D21H5/00; D21H5/0005; D21H5/0042; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31801; Y10T428/31804; Y10T428/31808
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
42 words
METHOD OF PREPARING AN ARTICLE COMPRISING A WAXIMPREGNATED POROUS CELLULOSIC STOCK HAVING THERMOSET POLYMER COATIG, WHICH COMPRISES: A. ESTABLISHING A HETEROGENEOUS COMPOSITE OF SOLID PARTICLES OF THE THERMOSETTING POLYMER IN FINELY DIVIDED FORM AND MOLTEN WAX, SAID PARTICLES HAVING THE FOLLOWING PROPERTIES:
Claim 2
Dependent Claim
42 words
METHOD OF PREPARING AN ARTICLE COMPRISING A WAXIMPREGNATED POROUS CELLULOSIC STOCK HAVING THERMOSET POLYMER COATIG, WHICH COMPRISES: A. ESTABLISHING A HETEROGENEOUS COMPOSITE OF SOLID PARTICLES OF THE THERMOSETTING POLYMER IN FINELY DIVIDED FORM AND MOLTEN WAX, SAID PARTICLES HAVING THE FOLLOWING PROPERTIES:
Claim 3
Dependent Claim
17 words
A CONVERSION TEMPERATURE BETWEEN THE MELTING POINT OF THE WAX AND THE DEGRADATION TEMPERATURE OF THE SUBSTRATE;
Claim 4
Dependent Claim
17 words
A CONVERSION TEMPERATURE BETWEEN THE MELTING POINT OF THE WAX AND THE DEGRADATION TEMPERATURE OF THE SUBSTRATE;
Claim 5
Dependent Claim
115 words
SUBSTANTIAL INSOLUBILITY IN THE MOLTEN WAX AT A TEMPERATURE BELOW THE CONVERSION TEMPERATURE OF THE POLYMER; B. APPLYING A COATING OF SAID HETEROGENEOUS COMPOSITE TO A POROUS CELLULOSIC SUBSTRATE AT A TEMPERATURE ABOVE THE MELTING POINT OF THE WAX BUT BELOW THE CONVERION TEMPERATURE OF THE THERMOSETTING POLYMER; THE AMOUNT OF COATING BEING REGULATED SO THAT AT LEAST MOST OF THE WAX THEREIN IS ADSORBABLE IN CELLULOSIC SUBSTRATE; C. HEATING SAID PARTICLES TO A TEMPERATURE BETWEEN THE CONVERSION TEMPERATURE OF THE THERMOSETTING POLYMER AND THE DEGRADATION TEMPERATURE OF THE SUBSTRATE AND APPLYING PRESSURE THERETO TO FORM A CONTINUOUS THERMOSET POLYMER LAYER ON THE SURFACE OF THE POROUS SUBSTRATE; D. AND THEREAFTER COOLING THE RESULTANT ARTICLE.
Claim 6
Dependent Claim
115 words
SUBSTANTIAL INSOLUBILITY IN THE MOLTEN WAX AT A TEMPERATURE BELOW THE CONVERSION TEMPERATURE OF THE POLYMER; B. APPLYING A COATING OF SAID HETEROGENEOUS COMPOSITE TO A POROUS CELLULOSIC SUBSTRATE AT A TEMPERATURE ABOVE THE MELTING POINT OF THE WAX BUT BELOW THE CONVERION TEMPERATURE OF THE THERMOSETTING POLYMER; THE AMOUNT OF COATING BEING REGULATED SO THAT AT LEAST MOST OF THE WAX THEREIN IS ADSORBABLE IN CELLULOSIC SUBSTRATE; C. HEATING SAID PARTICLES TO A TEMPERATURE BETWEEN THE CONVERSION TEMPERATURE OF THE THERMOSETTING POLYMER AND THE DEGRADATION TEMPERATURE OF THE SUBSTRATE AND APPLYING PRESSURE THERETO TO FORM A CONTINUOUS THERMOSET POLYMER LAYER ON THE SURFACE OF THE POROUS SUBSTRATE; D. AND THEREAFTER COOLING THE RESULTANT ARTICLE.
Claim 7
Dependent Claim
115 words
substantial insolubility in the molten wax at a temperature below the conversion temperature of the polymer; b. applying a coating of said heterogeneous composite to a porous cellulosic substrate at a temperature above the melting point of the wax but below the conversion temperature of the thermosetting polymer; the amount of coating being regulated so that at least most of the wax therein is adsorbable in cellulosic substrate; c. heating said particles to a temperature between the conversion temperature of the thermosetting polymer and the degradation temperature of the substrate and applying pressure thereto to form a continuous thermoset polymer layer on the surface of the porous substrate; d. and thereafter cooling the resultant article.
Claim 8
Dependent Claim
115 words
substantial insolubility in the molten wax at a temperature below the conversion temperature of the polymer; b. applying a coating of said heterogeneous composite to a porous cellulosic substrate at a temperature above the melting point of the wax but below the conversion temperature of the thermosetting polymer; the amount of coating being regulated so that at least most of the wax therein is adsorbable in cellulosic substrate; c. heating said particles to a temperature between the conversion temperature of the thermosetting polymer and the degradation temperature of the substrate and applying pressure thereto to form a continuous thermoset polymer layer on the surface of the porous substrate; d. and thereafter cooling the resultant article.
Claim 9
Dependent Claim
31 words
Method according to claim 1 wherein said heterogeneous composite contains 5 to 65 parts by weight of finely divided thermosetting polymer and 35 to 95 parts by weight of said wax.
Claim 10
Dependent Claim
17 words
Method according to claim 1 wherein all the finely divided thermosetting polymer is finer than 100 mesh.
Claim 11
Dependent Claim
17 words
Method according to claim 1 wherein all the finely divided thermosetting polymer is finer than 200 mesh.
Claim 12
Dependent Claim
12 words
Method according to claim 1 wherein the wax is a petroleum wax.
Claim 13
Dependent Claim
27 words
Method according to claim 5 wherein heterogeneous composite contains 5 to 65 parts by weight of finely divided thermosetting polymer, said polymer being finer than 100 mesh.
Claim 14
Dependent Claim
26 words
Method according to claim 1 wherein said solid thermosetting polymer Particles are allylic, polyepoxide, phenolic, amino, polyamide, thermoset polyurethane of ASTM type III, or cross-linkable polyvinylchloride.
Claim 15
Dependent Claim
34 words
Method according to claim 7 wherein the heterogeneous composite contains 5 to 65 parts by weight of finely divided thermosetting polymer, said polymer being finer than 100 mesh, and the wax is petroleum wax.
Claim 16
Dependent Claim
22 words
Method according to claim 8 wherein the solid thermosetting polymer is formed from diallyl phthalate, diallyl isophthalate, diallyl maleate or diallyl chlorendate.
Claim 17
Dependent Claim
29 words
Method according to claim 9 wherein said heterogeneous composite contains 10 to 55 parts by weight of finely divided polymer and 35 to 90 parts by weight of wax.
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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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |