US4740427A
Expired / Lapsed
US
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Vibration-damping composite metal plate
Assignee: Mitsubishi Chemical Corp
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Filing: 1986-05-15
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Granted: 1988-04-26
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Expires: 2006-05-15
Abstract
Abstract A vibration-damping resin composition of the invention comprises 10 to 95% by weight of an amorphous thermoplastic resin polymer (a) and 90 to 5% by weight of a crystalline thermoplastic polymer (b) incompatible with the polymer (a). The polymer (a) has a glass transition temperature lower than that of the polymer (b) and a maximum tanδ of 0.5 or more within a predetermined temperature and frequency range. The polymer (b) has a melting point higher than the glass transition temperature of the polymer (a) and a shear storage modulus of 1×10 8 dyne/cm 2 or more at the temperature and frequency at which the polymer (a) exhibits the maximum tanδ.
Inventors
- 👤 Masahide Ochiumi
- 👤 Shinji Horie
- 👤 Yukichi Watanabe
- 👤 Norihiro Sekizuka
- 👤 Akira Itsubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:13
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/14; Y; Y10; Y10S; Y10S525/00; Y10S525/931; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
219 words
A vibration-damping composite metal plate comprising two metal plates and a resin composition sandwiched between the metal plates, said resin composition consisting essentially of 20 to 70% by weight of an amorphous thermoplastic polymer (a), and 80 to 30% by weight of a crystalline thermoplastic polymer (b) incompatible with the polymer (a), at least one of monomers constituting the amorphous polymer (a) being graft or block copolymerized with the crystalline polymer (b) in an amount not less than 0.5% by weight based on a total amount of the polymer (a), the polymer (a) being at least one member selected from the group consisting of vinyl ester polymers, polymers of aromatic vinyl monomers and arylic ester polymers, and having a glass transition temperature lower than that of the polymer (b) and having a maximum tan δ not less than 0.5 with a temperature range of -50° to 150° C. and a frequency range of 0.1 to 20,000 Hz, and the polymer (b) being one member selected from the group consisting of crystalline α-olefin resins and crystalline condensation polymers, and having a melting point higher than the glass transition temperature of the polymer (a) and a shear storage modulus not less than 1×10 8 dyne/cm 2 at the temperature and frequency at which the polymer (a) exhibits the maximum tan δ.
Claim 2
Dependent Claim
219 words
A vibration-damping composite metal plate comprising two metal plates and a resin composition sandwiched between the metal plates, said resin composition consisting essentially of 20 to 70% by weight of an amorphous thermoplastic polymer (a), and 80 to 30% by weight of a crystalline thermoplastic polymer (b) incompatible with the polymer (a), at least one of monomers constituting the amorphous polymer (a) being graft or block copolymerized with the crystalline polymer (b) in an amount not less than 0.5% by weight based on a total amount of the polymer (a), the polymer (a) being at least one member selected from the group consisting of vinyl ester polymers, polymers of aromatic vinyl monomers and arylic ester polymers, and having a glass transition temperature lower than that of the polymer (b) and having a maximum tan δ not less than 0.5 with a temperature range of -50° to 150° C. and a frequency range of 0.1 to 20,000 Hz, and the polymer (b) being one member selected from the group consisting of crystalline α-olefin resins and crystalline condensation polymers, and having a melting point higher than the glass transition temperature of the polymer (a) and a shear storage modulus not less than 1×10 8 dyne/cm 2 at the temperature and frequency at which the polymer (a) exhibits the maximum tan δ.
Claim 3
Dependent Claim
54 words
The composite metal plate of claim 1, wherein the amorphous thermoplastic polymer (a) is a polymer selected from the group consisting of homopolymer of acrylic ester, homopolymer of aromatic vinyl monomer, and copolymer derived from an acrylic ester and an aromatic vinyl monomer, and the crystalline thermoplastic polymer (b) is a crystalline polyolefin (B).
Claim 4
Dependent Claim
37 words
The composite metal plate of claim 1, wherein the amorphous thermoplastic polymer (a) has a maximum tan δ not less than 1.0 at the temperature -50° to 150° C. and the frequency of 0.1 to 20,000 Hz.
Claim 5
Dependent Claim
25 words
The composite metal plate of claim 1, wherein the amorphous thermoplastic polymer (a) is a copolymer derived from a styrene monomer and an acrylic monomer.
Claim 6
Dependent Claim
38 words
The composite metal plate of claim 2, wherein the acrylic ester is a member selected from the group consisting of n-butyl acrylate, 2-ethylhexyl acrylate, linevol acrylate, iso-nonyl acrylate, 2-butoxyethyl acrylate, diethyleneglycol monobutylether acrylate, lauryl methacrylate, and tridecyl methacrylate.
Claim 7
Dependent Claim
27 words
The composite metal plate of claim 2, wherein the aromatic vinyl monomer is one member selected from the group consisting of styrene, 4-methyl styrene, and α-methyl styrene.
Claim 8
Dependent Claim
58 words
The composite metal plate of claim 2, wherein the acrylic ester is one member selected from the group consisting of n-butyl acrylate, 2-ethylhexyl acrylate, linevol acrylate, iso-nonyl acrylate, 2-butoxyethyl acrylate, diethyleneglycol monobutylether acrylate, lauryl methacrylate, and tridecyl methacrylate; and the aromatic vinyl monomer is one member selected from the group consisting of styrene, 4-methyl styrene and α-methyl styrene.
Claim 9
Dependent Claim
39 words
The composite metal plate of claim 1, wherein the crystalline thermoplastic polymer (b) has shear storage modulus not less than 5×10 8 dyne/cm 2 at the temperature and frequency at which the polymer (a) exhibits the maximum tan δ.
Claim 10
Dependent Claim
40 words
The composite metal plate of claim 1, wherein the crystalline thermoplastic polymer (b) has a shear storage modulus not less than 6×10 8 dyne/cm 2 at the temperature and frequency at which the polymer (a) exhibits the maximum tan δ.
Claim 11
Dependent Claim
33 words
The composite metal plate of claim 1, wherein the crystalline thermoplastic polymer (b) is one member selected from the group consisting of high density polyethylene, polypropylene and higher α-olefin polymers higher than polypropylene.
Claim 12
Dependent Claim
27 words
The composite metal plate of claim 2, wherein the crystalline polyolefin (B) is one member selected from the group consisting of high density polyethylene and propylene polymers.
Claim 13
Dependent Claim
15 words
The composite metal plate of claim 2, wherein the crystalline polyolefin (B) is propylene polymers.
Claim 14
Dependent Claim
31 words
The composite metal plate of claim 1, comprising 30 to 60% by weight of the amorphous thermoplastic polymer (a) and 70 to 40% by weight of the crystalline thermoplastic polymer (b).
Claim 15
Dependent Claim
34 words
The composite metal plate of claim 2, wherein the content of the acrylic ester in the polymer (A) derived from the acrylic ester and the aromatic vinyl monomer is 5 to 95% by weight.
Claim 16
Dependent Claim
49 words
The composite metal plate of claim 1, wherein at least one of the monomers constituting the amorphous thermoplastic polymer (a) is graft or block copolymerized with the crystalline thermoplastic polymer (b) in an amount not less than 1% by weight based on the total amount of the polymer (a).
Claim 17
Dependent Claim
49 words
The composite metal plate of claim 1, wherein at least one of the monomers constituting the amorphous thermoplastic polymer (a) is graft or block copolymerized with the crystalline thermoplastic polymer (b) in an amount not less than 3% by weight based on the total amount of the polymer (a).
Claim 18
Dependent Claim
33 words
The composite metal plate of claim 1, wherein the crystalline thermoplastic polymer (b) has a melting point at least 30° C. higher than the glass transition temperature of the amorphous thermoplastic polymer (a).
Claim 19
Dependent Claim
33 words
The composite metal plate of claim 1, wherein the crystalline thermoplastic polymer (b) has a melting point at least 50° C. higher than the glass transition temperature of the amorphous thermoplastic polymer (a).
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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) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |