Patent US4382108A successfully refreshed from Google Patents.
US4382108A
Expired / Lapsed
US
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Novel compositions and process
Assignee: Dow Chemical Co
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Filing: 1981-12-21
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Granted: 1983-05-03
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Expires: 2001-12-21
Abstract
Abstract Composite panels are disclosed which comprise outer layers derived from cellulosic and like material conventionally employed in particle boards and an inner layer which is comminuted scrap plastic material, the various layers and the particles in them being bonded together using an organic polyisocyanate binder. Optionally the binder contains an internal release agent. The composites, in addition to representing a valuable way in which to utilize scrap plastic, also possess improved properties compared with the corresponding panels which lack the inner core. In a particular embodiment the scrap plastic used is derived from junked automobiles.
Inventors
- 👤 Woodrow Carroll
- 👤 Thomas R. McClellan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:07
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/16; B27; B27N; B27N1/00; B27N1/02; B27N1/0209; B27N3/00; B27N3/002; B27N3/007; B27N3/06; B27N3/08; B27N3/10; B27N3/14; C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08J; C08J11/00; C08J11/04; C08J11/06; C08L; C08L97/00; C08L97/02; B32B2264/00; B32B2264/06; B32B2264/062; B32B2264/067; C08G2125/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/253; Y10T428/254; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998; Y10T428/31504; Y10T428/31551; Y10T428/31554; Y10T428/31591
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
73 words
A composite panel comprising: an inner core layer of scrap plastic in particulate form of a size such that the majority of the particles pass through a 10 U.S. mesh sieve; said inner core layer being sandwiched between outer layers of particles of cellulosic material capable of being compacted under pressure; said inner and outer layers and the particles in said layers being bonded together using a binder which comprises an organic polyisocyanate.
Claim 2
Dependent Claim
73 words
A composite panel comprising: an inner core layer of scrap plastic in particulate form of a size such that the majority of the particles pass through a 10 U.S. mesh sieve; said inner core layer being sandwiched between outer layers of particles of cellulosic material capable of being compacted under pressure; said inner and outer layers and the particles in said layers being bonded together using a binder which comprises an organic polyisocyanate.
Claim 3
Dependent Claim
28 words
A composite panel according to claim 1 wherein said cellulosic particles are selected from the class consisting of wood wafers, wood flakes, wood chips, sawdust and mixtures thereof.
Claim 4
Dependent Claim
27 words
A composite panel according to claim 1 or 2 wherein the scrap plastic particles have been produced by comminuting assorted scrap plastic utilizing a cryogenic grinding operation.
Claim 5
Dependent Claim
31 words
A composite panel according to claim 3 wherein the scrap plastic particles are of a size such that 95 percent of said particles will pass through a 20 U.S. mesh sieve.
Claim 6
Dependent Claim
46 words
A composite panel according to claim 1 wherein the organic polyisocyanate is a polymethylene polyphenyl polyisocyanate containing from about 25 to about 90 percent by weight of methylenebis(phenyl isocyanate) the remainder of said mixture being oligomeric polymethylene polyphenyl polyisocyanates having a functionality of greater than 2.
Claim 7
Dependent Claim
16 words
A composite panel according to claim 5 wherein said polyisocyanate also comprises an internal release agent.
Claim 8
Dependent Claim
35 words
A composite panel according to claim 6 wherein said internal release agent is selected from the group consisting of monoalkyl acid phosphates, dialkyl acid phosphates, pyrophosphates derived from said phosphates, alylsulfonic acids, and mixtures thereof.
Claim 9
Dependent Claim
62 words
A composite panel comprising: an inner core layer of scrap plastic in particulate form of a size such that the majority of the particles pass through a 10 U.S. mesh sieve; said inner core layer being sandwiched between outer layers of wood particles; said inner and outer layers and the particles in said layers being bonded together using an organic polyisocyanate binder.
Claim 10
Dependent Claim
62 words
A composite panel comprising: an inner core layer of scrap plastic in particulate form of a size such that the majority of the particles pass through a 10 U.S. mesh sieve; said inner core layer being sandwiched between outer layers of wood particles; said inner and outer layers and the particles in said layers being bonded together using an organic polyisocyanate binder.
Claim 11
Dependent Claim
45 words
A composite panel according to claim 8 wherein said polyisocyanate binder is a polymethylene polyphenyl polyisocyanate containing from about 25 to about 90 percent by weight of methylenebis(phenyl isocyanate) the remainder of said mixture being oligomeric polymethylene polyphenyl polyisocyanates having a functionality greater than 2.0.
Claim 12
Dependent Claim
16 words
A composite panel according to claim 8 or 9 wherein said outer layers comprise aspen wafers.
Claim 13
Dependent Claim
26 words
A composite panel according to claim 8 wherein said inner layer comprises scrap plastic particles produced by comminuting assorted scrap plastic utilizing a cryogenic grinding operation.
Claim 14
Dependent Claim
31 words
A composite panel according to claim 11 wherein said scrap plastic articles are of a size such that 95 percent of said particles will pass through a 20 U.S. mesh sieve.
Claim 15
Dependent Claim
104 words
A process for the preparation of a composite panel according to claim 1 which process comprises the steps of: coating said particles of cellulosic material and said particles of scrap plastic with said organic polyisocyanate binder; disposing a first layer of said coated particles of cellulosic material on a rigid mold plate; disposing a layer of said coated particles of scrap plastic on the upper surface of said first layer; disposing a second layer of said coated particles of cellulosic material on the upper surface of said layer of coated particles of scrap plastic; and applying heat and pressure to said assemblage of layers.
Claim 16
Dependent Claim
43 words
A process according to claim 13 wherein said particles of scrap plastic prior to coating have been produced by comminution using a cryogenic grinding operation to a size such that 95 percent of said particles will pass through a 20 U.S. mesh sieve.
Claim 17
Dependent Claim
27 words
A process according to claim 13 wherein said cellulosic particles are selected from the class consisting of wood wafers, wood flakes, wood chips, sawdust and mixtures thereof.
Claim 18
Dependent Claim
47 words
A process according to claim 13 wherein said organic polyisocyanate employed as binder is a polymethylene polyphenyl polyisocyanate containing from about 25 to about 90 percent by weight of methylenebis(phenyl isocyanate) the remainder of said mixture being oligomeric polymethylene polyphenyl polyisocyanates having a functionality greater than 2.0.
Claim 19
Dependent Claim
26 words
A process according to claim 13 wherein said particles of cellulosic material and said particles of scrap plastic are also coated with an internal release agent.
Claim 20
Dependent Claim
35 words
A process according to claim 17 wherein said internal release agent is selected from the group consisting of monoalkyl acid phosphates, dialkyl acid phosphates, pyrophosphates derived from said phosphates, alkyl sulfonic acids and mixtures thereof.
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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) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |