US4826552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of multiple-layer moldings
Assignee: Dynamit Nobel AG
•
Filing: 1987-04-29
•
Granted: 1989-05-02
•
Expires: 2007-04-29
Abstract
Abstract A process for the production of multiple-layer moldings from a substrate, member based on polypropylene and an elastomer foam is provided wherein lamination of the foam to the substrate member and shaping of the polypropylene take place in one working step.
Inventors
- 👤 Hans-Ulrich Breitscheidel
- 👤 Karlo Klaar
- 👤 Paul Spielau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:27
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/065; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C44/569; B29C48/00; B29C48/03; B29C48/07; B29C51/00; B29C51/14; B32B27/08; B29C44/3415; B29K; B29K2021/00; B29K2023/00; B29K2023/04; B29K2023/06; B29K2105/00; B29K2105/04; B32B2323/00; B32B2323/10; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/249993; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/31587
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
179 words
A process for the production of multiple-layer moldings with a substrate member based on polypropylene and with a foam layer, wherein, as the substrate member, an essentially planar precut blank of a sheet or panel based on polypropylene is heated to a temperature of 180°-220° C., said heated precut blank and a non-preheated foam layer in the shape of a flat precut blank or molding are inserted in a press having an upper mold portion and a lower mold portion, and the substrate member and the foam layer are simultaneously molded under pressure to produce a multiple-layer molding and are directly and adhesively bonded together, characterized in that an elastomer foam is utilized for the foam layer, the molding is effected under a pressure of about 20-120 bar, the precut blank for the substrate member is made from a crosslinkable, but essentially non-crosslinked polypropylene containing a crosslinking agent, and after removing the multiple-layer molding from the mold, crosslinking of the polypropylene is completed by storage, optionally at elevated temperatures of up to 140° C., in the presence of moisture.
Claim 2
Dependent Claim
179 words
A process for the production of multiple-layer moldings with a substrate member based on polypropylene and with a foam layer, wherein, as the substrate member, an essentially planar precut blank of a sheet or panel based on polypropylene is heated to a temperature of 180°-220° C., said heated precut blank and a non-preheated foam layer in the shape of a flat precut blank or molding are inserted in a press having an upper mold portion and a lower mold portion, and the substrate member and the foam layer are simultaneously molded under pressure to produce a multiple-layer molding and are directly and adhesively bonded together, characterized in that an elastomer foam is utilized for the foam layer, the molding is effected under a pressure of about 20-120 bar, the precut blank for the substrate member is made from a crosslinkable, but essentially non-crosslinked polypropylene containing a crosslinking agent, and after removing the multiple-layer molding from the mold, crosslinking of the polypropylene is completed by storage, optionally at elevated temperatures of up to 140° C., in the presence of moisture.
Claim 3
Dependent Claim
30 words
A process according to claim 1, characterized in that the substrate member is made from a glass-mat-reinforced polypropylene having a glass fiber content of between 20 and 60% by weight.
Claim 4
Dependent Claim
170 words
A process for the production of multiple-layer moldings with a substrate member based on polypropylene and with a foam layer, wherein, as the substrate member, an essentially planar precut blank of a sheet or panel based on polypropylene is heated to a temperature of 180°-220° C., said heated precut blank and a non-preheated foam layer in the shape of a flat precut blank or molding are inserted in a press having an upper mold portion and a lower mold portion, and the substrate member and the foam layer are simultaneously molded under pressure to produce a multiple-layer molding and are directly and adhesively bonded together, characterized in that an elastomer foam is utilized for the foam layer, the molding is effected under a pressure of about 20-120 bar, and the mold portions are set at differing temperatures, wherein the mold portion in contact with the substrate member during molding exhibits a temperature that is higher by at least 20° C. than the mold portion in contact with the foam layer.
Claim 5
Dependent Claim
170 words
A process for the production of multiple-layer moldings with a substrate member based on polypropylene and with a foam layer, wherein, as the substrate member, an essentially planar precut blank of a sheet or panel based on polypropylene is heated to a temperature of 180°-220° C., said heated precut blank and a non-preheated foam layer in the shape of a flat precut blank or molding are inserted in a press having an upper mold portion and a lower mold portion, and the substrate member and the foam layer are simultaneously molded under pressure to produce a multiple-layer molding and are directly and adhesively bonded together, characterized in that an elastomer foam is utilized for the foam layer, the molding is effected under a pressure of about 20-120 bar, and the mold portions are set at differing temperatures, wherein the mold portion in contact with the substrate member during molding exhibits a temperature that is higher by at least 20° C. than the mold portion in contact with the foam layer.
Claim 6
Dependent Claim
30 words
A process according to claim 3, characterized in that the substrate member is made from a glass-mat-reinforced polypropylene having a glass fiber content of between 20 and 60% by weight.
Claim 7
Dependent Claim
149 words
A process for the production of multiple-layer moldings with a substrate member based on polypropylene and with a foam layer, wherein, as the substrate member, an essentially planar precut blank of a sheet or panel based on polypropylene is heated to a temperature of 180°-220° C., said heated precut blank and a non-preheated foam layer in the shape of a flat precut blank or molding are inserted in a press having an upper mold portion and a lower mold portion, and the substrate member and the foam layer are simultaneously molded under pressure to produce a multiple-layer molding and are directly and adhesively bonded together, characterized in that an elastomer foam is utilized for the foam layer, the molding is effected under a pressure of about 20-120 bar, and the mold portion in contact with a substrate member during molding has a temperature of about 50° to 80° C.
Claim 8
Dependent Claim
149 words
A process for the production of multiple-layer moldings with a substrate member based on polypropylene and with a foam layer, wherein, as the substrate member, an essentially planar precut blank of a sheet or panel based on polypropylene is heated to a temperature of 180°-220° C., said heated precut blank and a non-preheated foam layer in the shape of a flat precut blank or molding are inserted in a press having an upper mold portion and a lower mold portion, and the substrate member and the foam layer are simultaneously molded under pressure to produce a multiple-layer molding and are directly and adhesively bonded together, characterized in that an elastomer foam is utilized for the foam layer, the molding is effected under a pressure of about 20-120 bar, and the mold portion in contact with a substrate member during molding has a temperature of about 50° to 80° C.
Claim 9
Dependent Claim
20 words
A process according to claim 5, characterized in that an open-cell flexible polyurethane foam is utilized as the elastomer foam.
Claim 10
Dependent Claim
31 words
A process according to claim 6, characterized by using, as the elastomer foam, a polyester urethane foam or a polyether urethane foam having a foam density of 20-100 kg/m 3 .
Claim 11
Dependent Claim
21 words
A process according to claim 5, characterized by using a precut blank of elastomer foam having a thickness of 5-50 mm.
Claim 12
Dependent Claim
37 words
A process according to claim 5, characterized by using an elastomer foam layer having a unilateral or bilateral surface seal, especially in the form of a very thin, compact skin produced by superficial melting of the foam.
Claim 13
Dependent Claim
23 words
A process according to claim 5, characterized by using a precut blank for the substrate member having a thickness of about 1-5 mm.
Claim 14
Dependent Claim
157 words
A process for the production of multiple-layer moldings with a substrate member based on polypropylene and with a foam layer, wherein, as the substrate member, an essentially planar precut blank of a sheet or panel based on polypropylene is heated to a temperature of 180°-220° C., said heated precut blank and a non-preheated foam layer in the shape of a flat precut blank or molding are inserted in a press having an upper mold portion and a lower mold portion, and the substrate member and the foam layer are simultaneously molded under pressure to produce a multiple-layer molding and are directly and adhesively bonded together, characterized in that an elastomer foam is utilized for the foam layer, the molding is effected under a pressure of about 20-120 bar, and for the formation of the substrate member, several precut blanks based on polypropylene are layered one upon the other, especially after preheating and are inserted in the mold.
Claim 15
Dependent Claim
157 words
A process for the production of multiple-layer moldings with a substrate member based on polypropylene and with a foam layer, wherein, as the substrate member, an essentially planar precut blank of a sheet or panel based on polypropylene is heated to a temperature of 180°-220° C., said heated precut blank and a non-preheated foam layer in the shape of a flat precut blank or molding are inserted in a press having an upper mold portion and a lower mold portion, and the substrate member and the foam layer are simultaneously molded under pressure to produce a multiple-layer molding and are directly and adhesively bonded together, characterized in that an elastomer foam is utilized for the foam layer, the molding is effected under a pressure of about 20-120 bar, and for the formation of the substrate member, several precut blanks based on polypropylene are layered one upon the other, especially after preheating and are inserted in the mold.
Claim 16
Dependent Claim
33 words
A process according to claim 11, characterized in that the precut blanks based on polypropylene are compression molded together with precut blanks or moldings of elastomer foam under a pressure of 20-40 bar.
Claim 17
Dependent Claim
151 words
A process for the production of multiple-layer moldings with a substrate member based on polypropylene and with a foam layer, wherein, as the substrate member, an essentially planar precut blank of a sheet or panel based on polypropylene is heated to a temperature of 180°-220° C., said heated precut blank and a non-preheated foam layer in the shape of a flat precut blank or molding are inserted in a press having an upper mold portion and a lower mold portion, and the substrate member and the foam layer are simultaneously molded under pressure to produce a multiple-layer molding and are directly and adhesively bonded together, characterized in that an elastomer foam is utilized for the foam layer, the molding is effected under a pressure of about 20-120 bar, and precut blanks based on polypropylene are shaped together with the precut blanks or moldings of elastomer foam under pressure of 50-120 bar.
Claim 18
Dependent Claim
151 words
A process for the production of multiple-layer moldings with a substrate member based on polypropylene and with a foam layer, wherein, as the substrate member, an essentially planar precut blank of a sheet or panel based on polypropylene is heated to a temperature of 180°-220° C., said heated precut blank and a non-preheated foam layer in the shape of a flat precut blank or molding are inserted in a press having an upper mold portion and a lower mold portion, and the substrate member and the foam layer are simultaneously molded under pressure to produce a multiple-layer molding and are directly and adhesively bonded together, characterized in that an elastomer foam is utilized for the foam layer, the molding is effected under a pressure of about 20-120 bar, and precut blanks based on polypropylene are shaped together with the precut blanks or moldings of elastomer foam under pressure of 50-120 bar.
References Cited (Backward Citations)
US3352742A
Cited
DE2303481A1
Cited
DE2545700A1
Cited
US4478660A
Cited
US4692373A
Cited
US4659618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |