US3983295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid or semirigid foams and process of making them
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1974-11-07
•
Granted: 1976-09-28
•
Expires: 1994-11-07
Abstract
Abstract A rigid or semi rigid self-skinned cellular plastic structure which is heat recoverable and thermoelastic is prepared by a process wherein a plastisol or pregelified dry-blend of a homo- or copolymer of vinylchloride (PVC dispersion resin), a polymerizable polyfunctional allyl or vinyl monomer (o-diallyl phthalate), and a peroxide catalyst is prepared, and the plastisol or dryblend is heated so that the reacting mass is free to expand without restraint in at least one direction with a temperature rise of 10 DEG -30 DEG C/minute at least up to the temperature at which expansion of the reaction mass starts. This cellular structure is rigid at normal temperatures and behaves like an elastomer at high temperatures. The product can be subjected to fabrication techniques such as sheet molding, encapsulation expansion from compressed foam etc.
Inventors
- 👤 Angelo Murer
- 👤 Mario Borsatti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:17
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/34; C08J9/04; C08J9/12; C08J9/14; B; B29; B29K; B29K2027/00; B29K2027/06; B29K2105/00; B29K2105/04; B29K2105/043; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P70/00; Y02P70/10; Y10; Y10S; Y10S264/00; Y10S264/14; Y10T; Y10T428/00; Y10T428/23; Y10T428/233; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249989
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
123 words
A method for preparing a heat recoverable thermoelastic self-skinned cellular plastic structure consisting essentially of: A. preparing a vinyl chloride composition, wherein said composition is a plastisol or a pregelified dry-blend of: 1 . a dispersion type vinyl chloride polymer; 2. a non-volatile polymerizable polyfunctional monomer selected from the group consisting of allyl and vinyl monomers; 3. a peroxide catalyst; and B. depositing said composition in an open mold cavity; C. heating said vinyl chloride composition at a rate of about 10° C. to about 30° C./minute to at least the temperature at which said monomer rapidly cures and expansion of the reaction mass commences in said mold cavity wherein the vinyl chloride composition is free to expand in at least one direction.
Claim 2
Independent Claim
123 words
A method for preparing a heat recoverable thermoelastic self-skinned cellular plastic structure consisting essentially of: A. preparing a vinyl chloride composition, wherein said composition is a plastisol or a pregelified dry-blend of: 1 . a dispersion type vinyl chloride polymer; 2. a non-volatile polymerizable polyfunctional monomer selected from the group consisting of allyl and vinyl monomers; 3. a peroxide catalyst; and B. depositing said composition in an open mold cavity; C. heating said vinyl chloride composition at a rate of about 10° C. to about 30° C./minute to at least the temperature at which said monomer rapidly cures and expansion of the reaction mass commences in said mold cavity wherein the vinyl chloride composition is free to expand in at least one direction.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the dispersion type vinyl chloride polymer is a dispersion type polyvinyl chloride.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein the dispersion type vinyl chloride polymer is a copolymer of a dispersion type vinyl chloride and a second vinyl monomer.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein the vinyl chloride composition is heated to a temperature of about 110° C. to about 200° C.
Claim 6
Dependent Claim
22 words
The method of claim 1 wherein the polyfunctional monomer is selected from the group consisting of O-diallylphthalate, diallyl maleate and divinyl benzene.
Claim 7
Dependent Claim
10 words
Th method of claim 1 wherein a stabilizer is used.
Claim 8
Dependent Claim
29 words
The method of claim 6 wherein the stabilizer is selected from the group consisting of lead salts, organo tins, tin mercaptides, barium-cadmium-zinc compounds, calcium-zinc compounds, polyols and nitrogen compounds.
Claim 9
Dependent Claim
13 words
The method of claim 1 wherein the peroxide catalyst is an organic peroxide.
Claim 10
Dependent Claim
12 words
The method of claim 8 wherein the organic peroxide is dicumyl peroxide.
Claim 11
Dependent Claim
13 words
The method of claim 1 wherein the peroxide catalyst is an inorganic peroxide.
Claim 12
Dependent Claim
24 words
The method of claim 1 wherein the dispersion type vinyl chloride polymer has a viscosity of about 2000 to 20,000 cps. at 20° C.
Claim 13
Dependent Claim
23 words
The method of claim 1 wherein the dispersion type vinyl chloride polymer has a particle size of about 0.1 to about 5.0 microns.
Claim 14
Dependent Claim
23 words
The method of claim 1 wherein the dispersion type vinyl chloride polymer has a particle size of about 0.5 to about 2.0 microns.
Claim 15
Dependent Claim
22 words
The method of claim 1 wherein the dispersion type vinyl chloride polymer has a K value of about 45 to about 90.
Claim 16
Dependent Claim
10 words
The method of claim 1 wherein conventional fillers are incorporated.
Claim 17
Dependent Claim
19 words
The method of claim 1 wherein the heating rate is about 15° C. to about 25° C. per minute.
Claim 18
Dependent Claim
5 words
The product of claim 1.
Claim 19
Independent Claim
154 words
A method of preparing a heat recoverable thermoelastic self-skinned cellular structure consisting essentially of: A. preparing a plastisol from a: 1. a dispersion type vinyl chloride polymer said plastisol having a viscosity of about 2,000 to about 20,000 cps, said polymer having a particle size of about 0.1 to about 5.0 microns and a K-value of about 45 to about 90; 2. a polymerizable polyfunctional monomer having a boiling point of at least 180° C. selected from the group consisting of allyl and vinyl monomers; 3. an organic peroxide; 4. a polyvinyl chloride stabilizer; and B. depositing said plastisol in an open mold cavity; C. heating said plastisol to a temperature of about 10° C. to about 30° C./minute to at least a temperature at which said monomer rapidly cures and the expansion of the reaction mass commences in said mold cavity wherein said plastisol is free to expand in at least one direction.
Claim 20
Independent Claim
154 words
A method of preparing a heat recoverable thermoelastic self-skinned cellular structure consisting essentially of: A. preparing a plastisol from a: 1. a dispersion type vinyl chloride polymer said plastisol having a viscosity of about 2,000 to about 20,000 cps, said polymer having a particle size of about 0.1 to about 5.0 microns and a K-value of about 45 to about 90; 2. a polymerizable polyfunctional monomer having a boiling point of at least 180° C. selected from the group consisting of allyl and vinyl monomers; 3. an organic peroxide; 4. a polyvinyl chloride stabilizer; and B. depositing said plastisol in an open mold cavity; C. heating said plastisol to a temperature of about 10° C. to about 30° C./minute to at least a temperature at which said monomer rapidly cures and the expansion of the reaction mass commences in said mold cavity wherein said plastisol is free to expand in at least one direction.
Claim 21
Dependent Claim
18 words
The method of claim 18 wherein the dispersion type vinyl chloride polymer is a dispersion type polyvinyl chloride.
Claim 22
Dependent Claim
26 words
The method of claim 18 wherein the dispersion type vinyl chloride polymer is a copolymer of a dispersion type vinyl chloride and a second vinyl monomer.
Claim 23
Dependent Claim
21 words
The method of claim 18 wherein the plastisol is heated to a temperature of about 110° C. to about 200° C.
Claim 24
Dependent Claim
22 words
The method of claim 18 wherein the polyfunctional monomer is selected from the group consisting of O-diallylphthalate, diallyl maleate and divinyl benzene.
Claim 25
Dependent Claim
12 words
The method of claim 18 wherein the organic peroxide is dicumyl peroxide.
Claim 26
Dependent Claim
23 words
The method of claim 18 wherein the plastisol is heated at a rate of about 15° C. to about 25° C. per minute.
Claim 27
Dependent Claim
31 words
The method of claim 18 wherein the amount of polyfunctional monomer used is from about 20 to about 300 parts by weight per 100 parts by weight of vinyl chloride polymer.
Claim 28
Dependent Claim
31 words
The method of claim 18 wherein the amount of polyfunctional monomer used is from about 40 to about 80 parts by weight per 100 parts by weight of vinyl chloride polymer.
Claim 29
Dependent Claim
26 words
The method of claim 18 wherein the plastisol is heated for a period of about 5 to about 15 minutes per centimeter thickness of said plastisol.
Claim 30
Dependent Claim
43 words
The method of claim 18 wherein a second polymeric compound selected from the group consisting of an acrylonitrile-butadiene-styrene resin, a methacrylate-butadiene styrene resin, an acrylonitrile-butadiene acrylate resin, an ethylene/vinyl acetate copolymer, an acrylic polymer and a chlorinated polyethylene is added to the plastisol.
Claim 31
Dependent Claim
34 words
The method of claim 28 wherein the second polymeric compound is added in the amount of about 5 to about 100 parts by weight per 100 parts by weight of the vinyl chloride polymer.
References Cited (Backward Citations)
US3066110A
Cited
US3365353A
Cited
US3855160A
Cited
US3786004A
Cited
US3770662A
Cited
US3804933A
Cited
US3857915A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |