EP0427567A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Parabolic antenna reflector and process for preparing same
Assignee: Bridgestone Corp
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Filing: 1990-11-09
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Granted: —
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Expires: 2010-11-09
Abstract
Abstract The invention relates to parabolic antenna reflectors (1) wherein a cycloolefin type random copolymer, a modified polyolefin polymer or a composition comprising a polyamide and a polyolefin is used as the resin which forms a back-up layer (4). The parabolic antenna reflectors (1) of the present invention have excellent interlaminar bond strength between a metallic layer (3) and the back-up layer (4) ,and do not delaminate even when each layer is foamed or shrunk by heat cycle after molding. Moreover, the parabolic antenna reflectors (1) have excellent surface accuracy and corrosion resistance, do not cause unevenness in radio wave reflection, retain radio wave reflectivity over a long period of time and may be simply prepared with excellent moldability.
Inventors
- 👤 Yukio C/O Mitsui Petrochem. Ind. Ltd. Yoshihara
- 👤 Tatsuya Kanayama
- 👤 Shiro C/O Mitsui Petrochem. Ind. Ltd. Honma
- 👤 Toshikhiko Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 17:17
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B29; B29C; B29C45/00; B29C45/14; B29C45/14778; B29C45/14811; B32B27/00; B32B27/18; B32B27/20; B32B37/00; B32B37/12; B32B38/00; B32B38/0008; B32B5/00; B32B5/18; H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/141; H01Q15/16; B29K; B29K2705/00; B29L; B29L2031/00; B29L2031/34; B29L2031/3456; B32B2310/00; B32B2310/14
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
183 words
A parabolic antenna reflector comprising a laminate of, in order, a protective resin layer, a metallic layer and a back-up layer wherein the back-up layer is composed of a copolymer [A] which is a cycloolefin type random copolymer comprising an ethylene component and a cycloolefin component derived from a monomer of general formula [I]: wherein n is 0 or 1, m is 0 or a positive integer, q is 0 or 1, R¹ - R¹⁸ individually represent hydrogen, halogen or a hydrocarbon group, R¹⁵ - R¹⁸ may link together to form a mono- or polycyclic ring which may have a double bond, and R¹⁵ together with R¹⁶ or R¹⁷ together with R¹⁸ may form an alkylidene group, or general formula [II]: wherein is 0 or an integer of at least 1, m and n are each 0, 1 or 2, R¹ - R¹⁵ individually represent hydrogen, halogen, an aliphatic hydrocarbon group an aromatic hydrocarbon group or an alkoxy group, and R⁵ (or R⁶) and R⁹ (or R⁷) may link together to form an alkylene group of 1-3 carbon atoms or a direct bond.
Claim 2
Dependent Claim
183 words
A parabolic antenna reflector comprising a laminate of, in order, a protective resin layer, a metallic layer and a back-up layer wherein the back-up layer is composed of a copolymer [A] which is a cycloolefin type random copolymer comprising an ethylene component and a cycloolefin component derived from a monomer of general formula [I]: wherein n is 0 or 1, m is 0 or a positive integer, q is 0 or 1, R¹ - R¹⁸ individually represent hydrogen, halogen or a hydrocarbon group, R¹⁵ - R¹⁸ may link together to form a mono- or polycyclic ring which may have a double bond, and R¹⁵ together with R¹⁶ or R¹⁷ together with R¹⁸ may form an alkylidene group, or general formula [II]: wherein is 0 or an integer of at least 1, m and n are each 0, 1 or 2, R¹ - R¹⁵ individually represent hydrogen, halogen, an aliphatic hydrocarbon group an aromatic hydrocarbon group or an alkoxy group, and R⁵ (or R⁶) and R⁹ (or R⁷) may link together to form an alkylene group of 1-3 carbon atoms or a direct bond.
Claim 3
Dependent Claim
47 words
A parabolic antenna reflector comprising a laminate of, in order, a protective resin, a metallic layer and a back-up layer, wherein the back-up layer comprises a copolymer [A] as defined in claim 1 and a non-crystalline or low-crystalline α-olefin elastomeric copolymer composed of at least two olefins.
Claim 4
Dependent Claim
43 words
A parabolic antenna reflector comprising a laminate of, in order, a protective resin layer a metallic layer and back-up layer, wherein the back-up layer comprises a modified olefin polymer obtainable by modifying an olefin polymer with a modifier which has a polar group.
Claim 5
Dependent Claim
43 words
A parabolic antenna reflector comprising a laminate of, in order, a protective resin layer a metallic layer and back-up layer, wherein the back-up layer comprises a modified olefin polymer obtainable by modifying an olefin polymer with a modifier which has a polar group.
Claim 6
Dependent Claim
26 words
A parabolic antenna reflector according to claim 3, wherein said modifier is a carboxylic acid, acid anhydride or carboxylic acid derivative containing an ethylenically unsaturated group.
Claim 7
Dependent Claim
32 words
A parabolic antenna reflector according to claim 3 or 4, wherein said modified olefin polymer contains a constituent unit derived from said modifier in an amount of 0.01 to 10% by weight.
Claim 8
Dependent Claim
30 words
A parabolic antenna reflector comprising a laminate of, in order, a protective resin layer, a metallic layer and back-up layer, wherein the back-up layer comprises a polyamide and a polyolefin.
Claim 9
Dependent Claim
30 words
A parabolic antenna reflector comprising a laminate of, in order, a protective resin layer, a metallic layer and back-up layer, wherein the back-up layer comprises a polyamide and a polyolefin.
Claim 10
Dependent Claim
19 words
A parabolic antenna reflector according to claim 6, wherein said polyolefin is partially or wholly modified with a modifier.
Claim 11
Dependent Claim
24 words
A parabolic antenna reflector according to any one of claims 1 to 7, wherein said resin which comprises the back-up layer contains a filler.
Claim 12
Dependent Claim
22 words
A parabolic antenna reflector according to any one of the preceding claims wherein said resin which comprises the back-up layer is foamed.
Claim 13
Dependent Claim
34 words
A parabolic antenna reflector according to claim 9 wherein said resin is foamed at an expansion ratio of 1.03 to 1.3 and the maximum diameter of foamed cells is not larger than 0.5 mm.
Claim 14
Dependent Claim
118 words
A process for preparing a parabolic antenna reflector as claimed in any one of the preceding claims, which comprises: either laminating a resin film or sheet onto one side of a metallic layer or coating one side of the metallic layer with a resin to form a protective resin layer on one side of the metallic layer; placing the resulting laminate in a mold in such a way that the protective resin layer is brought into contact with a convex surface of the mold; and then injecting the resin which is to form the back-up layer through the nozzle of the mold into the mold to form the back-up layer on the other side of the metallic layer.
Claim 15
Dependent Claim
39 words
A process according to claim 11, wherein the metallic layer is pretreated by plasma treatment or primer treatment or an adhesive layer is preformed on the other side of the metallic layer by laminating an adhesive resin film thereon.
Claim 16
Dependent Claim
101 words
A process according to claim 11 or 12 for preparing a parabolic antenna reflector as claimed in claim 3, wherein said modified polyolefin polymer is composed of modified polyolefin particles obtained by contacting 100 parts by weight of polyolefin particles with 0.01 to 50 parts by weight of a carboxylic acid, acid anhydride or carboxylic acid derivative containing an ethylenically unsaturated group in the presence of 10 to 50 parts by weight of a solvent having solubility of not more than 0.5 wt% in water or a solvent mixture thereof and 0.01 to 10 parts by weight of a radical initiator.
Claim 17
Dependent Claim
57 words
A process according to claim 11 or 12 for preparing a parabolic antenna reflector as claimed in claim 9 or 10, wherein the resin which forms the back-up layer contains a blowing agent, the resin is injected into a mold and pressure within the mold is reduced just before the completion of injection to foam the resin.
References Cited (Backward Citations)
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