Patent US4668729A successfully refreshed from Google Patents.
US4668729A
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US
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Process for compression molding of thermoplastic resin and moldings molded by said process
Assignee: Asahi Kasei Corp
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Filing: 1984-12-14
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Granted: 1987-05-26
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Expires: 2004-12-14
Abstract
Abstract The present invention concerns a process for a thin sheet molding of a thermoplastic resin easily and economically and also the thin oriented sheet molding prepared by such a process. Its specific feature resides in the steps of lubricating the inner surface of die, laying over one another thermoplastic resin blanks while being not adhered to each other in a die, compressing the layered structure at a temperature higher than the glass transition temperature of the thermoplastic resin blanks and separating the oriented molded products from each other.
Inventors
- 👤 Hiroshi Kataoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:16
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/18; B29C37/00; B29C2037/92; B29K; B29K2995/00; B29K2995/0037; B29K2995/005; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T156/00; Y10T156/19; Y10T156/1911
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
91 words
A process for molding an oriented molding by compressing thermoplatic resin blanks in a compression die, comprising the steps of: 1. placing two or more layers of thermoplastic resin blanks layered without being adhered to each other; 2. lubricating the inner surface of the die; 3. orienting the resin blank by compression at a temperature higher than the glass transition point of said resin blanks; and 4. taking out the molded products after setting from the die and peeling the oriented moldings from each other to give two or more moldings.
Claim 2
Dependent Claim
91 words
A process for molding an oriented molding by compressing thermoplatic resin blanks in a compression die, comprising the steps of: 1. placing two or more layers of thermoplastic resin blanks layered without being adhered to each other; 2. lubricating the inner surface of the die; 3. orienting the resin blank by compression at a temperature higher than the glass transition point of said resin blanks; and 4. taking out the molded products after setting from the die and peeling the oriented moldings from each other to give two or more moldings.
Claim 3
Dependent Claim
13 words
The process of claim 1, wherein the thermoplastic resin is an acrylic resin.
Claim 4
Dependent Claim
30 words
The process of claim 1, wherein the thermoplastic is selected from among polystyrene, styrene-acrylonitrile copolymer, ABS resin, polyvinyl chloride, polyetherimide, polyvinyl alcohol, polycarbonate, polyester, nylon, polyphenylenether, polyoxymethylene, polyethylene and polypropylene.
Claim 5
Dependent Claim
24 words
The process of claim 1, 2 or 3, wherein the thermoplastic resin contains at least one reinforcing material of glass fiber, mica and asbestos.
Claim 6
Dependent Claim
15 words
The process of claim 1, 2 or 3, wherein a biaxially oriented molding is molded.
Claim 7
Dependent Claim
34 words
The process of claim 1, wherein a peeling sheet comprising a resin non-adherable to the blanks is disposed between the respective adjacent blanks, thereby making the respective adjacent blanks not adhered to each other.
Claim 8
Dependent Claim
17 words
The process of claim 6, wherein the peeling sheet is a thermoplastic resin having a smooth surface.
Claim 9
Dependent Claim
23 words
The process of claim 6, wherein the peeling sheet is a thermoplastic resin sheet containing a powder of calcium carbonate, talc or mica.
Claim 10
Dependent Claim
28 words
The process of claim 6, 7, or 8, wherein after layering of the blanks and the peeling sheets, the layered structure is subjected to vacuum packaging before molding.
Claim 11
Dependent Claim
26 words
A thin sheet produced by a process for molding an oriented molding by compressing a thermoplastic resin blank in a compression die, comprising the steps of:
Claim 12
Dependent Claim
26 words
A thin sheet produced by a process for molding an oriented molding by compressing a thermoplastic resin blank in a compression die, comprising the steps of:
Claim 13
Dependent Claim
70 words
placing two of more layers of thermoplastic resin blanks layered without being adhered to each other; 2. lubricating the inner surface of the die; 3. orienting the resin blank by compression at a temperature higher than the glass transition point of said resin blanks; and 4. taking out the molded products after setting from the die and peeling the oriented moldings from each other to give two or more moldings.
Claim 14
Dependent Claim
70 words
placing two of more layers of thermoplastic resin blanks layered without being adhered to each other; 2. lubricating the inner surface of the die; 3. orienting the resin blank by compression at a temperature higher than the glass transition point of said resin blanks; and 4. taking out the molded products after setting from the die and peeling the oriented moldings from each other to give two or more moldings.
Claim 15
Dependent Claim
15 words
A thin sheet according to claim 10, wherein the thermoplastic resin is an acrylic resin.
Claim 16
Dependent Claim
33 words
A thin sheet according to claim 10, wherein the thermoplastic resin is selected from among polystyrene, styrene-acrylonitrile copolymer, ABS resin, polyvinyl chloride, polyetherimide, polyvinyl alcohol, polycarbonate, polyester, nylon, polyphenylenether, polyoxymethylene, polyethylene and polypropylene.
Claim 17
Dependent Claim
29 words
A thin sheet according to any one of claims 10, 11 or 12, wherein the thermoplastic resin contains at least one reinforcing material of glass fiber, mica and asbestos.
Claim 18
Dependent Claim
20 words
A thin sheet according to any one of claims 10, 11 or 12, wherein a biaxially oriented molding is molded.
Claim 19
Dependent Claim
36 words
A thin sheet according to claim 10, wherein a peeling sheet comprising a resin non-adherable to the blanks is disposed between the respective adjacent blanks, thereby making the respective adjacent blanks not adhered to each other.
Claim 20
Dependent Claim
19 words
A thin sheet according to claim 15, wherein the peeling sheet is a thermoplastic resin having a smooth surface.
Claim 21
Dependent Claim
25 words
A thin sheet according to claim 15, wherein the peeling sheet is a thermoplastic resin sheet containing a powder of calcium carbonate, talc or mica.
Claim 22
Dependent Claim
33 words
A thin sheet according to any one of claims 15, 16 or 17, wherein after layering of the blanks and the peeling sheets, the layered structure is subjected to vacuum packaging before molding.
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) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |