EP0034678A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Lightweight and dimensionally accurate resin concrete molded products, and a method of making the same
Assignee: Inax Corp
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Filing: 1980-10-01
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Granted: —
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Expires: 2000-10-01
Abstract
Abstract A lightweight and highly dimensionally accurate molded resin concrete product essentially comprises an intermediate layer (4a) composed of resin concrete having a resin content of about 10 to 70%, and a thickness which is not greater than 20 / 1,000 of its maximum length, and a pair of reinforcing layers (3a, 5a) composed of a fiber reinforced plastics material, and between which the resin concrete layer is sandwiched. The product having a very small wall thickness, and high hot water resistance is particularly useful as a bathtub, or the like. A method of making such a molded resin concrete product is also disclosed in which the intermediate layer (4a) is cured after solidification and shrinkage of the reinforcing layers (3a, 5a).
Inventors
- 👤 Takuji Koyanagi
- 👤 Nobuhiro Ono
- 👤 Hiroyuki Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 03:05
CPC Classifications
A; A47; A47K; A47K3/00; A47K3/02; B; B29; B29C; B29C67/00; B29C67/24; B29C67/242; B29C67/243; B29C70/00; B29C70/003; B29C70/02; B29C70/021; B29C70/025; B29C70/04; B29C70/28; B29C70/30; B29C70/305; B29C70/68; B29C70/84; B29D; B29D22/00; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B32B27/36; B32B5/00; B32B5/02; B32B5/022; B32B5/024; B29K; B29K2067/00; B29K2067/06; B29K2105/00; B29K2105/0094; B29K2105/06; B29K2105/08; B29K2105/0809; B29K2105/0854; B29K2105/16; B29K2503/00; B29K2503/04; B29K2503/08; B29L; B29L2031/00; B29L2031/769; B29L2031/7692; B32B2262/00; B32B2262/10; B32B2262/101; B32B2305/00; B32B2305/08; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1352; Y10T428/1355; Y10T428/1359; Y10T428/1362; Y10T428/1366; Y10T428/1372; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T442/00; Y10T442/20; Y10T442/2041; Y10T442/2098; Y10T442/2107
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
71 words
A lightweight and highly dimensionally accurate molded resin concrete product comprising: an intermediate layer composed of resin concrete having a resin content in the range of from approximately 10 to 70%, said intermediate layer having a thickness which is not greater than 20/1,000 of the maximum length thereof, and a reinforcing layer formed on each of the opposite surfaces of said intermediate layer, and composed of a fiber reinforced plastics material.
Claim 2
Dependent Claim
71 words
A lightweight and highly dimensionally accurate molded resin concrete product comprising: an intermediate layer composed of resin concrete having a resin content in the range of from approximately 10 to 70%, said intermediate layer having a thickness which is not greater than 20/1,000 of the maximum length thereof, and a reinforcing layer formed on each of the opposite surfaces of said intermediate layer, and composed of a fiber reinforced plastics material.
Claim 3
Dependent Claim
56 words
A molded resin concrete product according to claim 1, wherein one of said reinforcing layers which faces the viewer of said product is composed of a transparent fiber reinforced plastics material comprising a transparent resin, and a fabric of glass fibers having a unit weight of at least 150 g/m2, and impregnated with said transparent resin.
Claim 4
Dependent Claim
19 words
A molded resin concrete product according to claim 2, wherein said fabric of glass fibers is a woven fabric.
Claim 5
Dependent Claim
19 words
A molded resin concrete product according to claim 2, wherein said fabric of glass fibers is a nonwoven fabric.
Claim 6
Dependent Claim
43 words
A molded resin concrete product according to any preceding claim, wherein said resin concrete is transparent, and prepared from an inorganic filler having a refractive index of 1.50 to 1.60 and an unsaturated polyester resin having a refractive index of 1.48 to 1.62.
Claim 7
Dependent Claim
17 words
A molded resin concrete product according to claim 5, wherein said inorganic filler comprises a vitreous substance.
Claim 8
Dependent Claim
44 words
A molded resin concrete product according to claim 2, 3 or 4, further comprising a gelcoat layer formed by a transparent resin on the opposite side of said one reinforcing layer from said intermediate layer, and having a thickness of 300 to 500 microns.
Claim 9
Dependent Claim
23 words
A bathtub defined by a molded resin concrete product according to claim 7, and having an inner surface formed by said gelcoat layer.
Claim 10
Independent Claim
119 words
A method of making a molded resin product comprising: . forming a first reinforcing layer on a mold from a fiber reinforced plastics material; applying resin concrete having a resin content in the range of from approximately 10 to 70%, and containing a hot curing composition on to said first reinforcing layer to form an intermediate layer thereon; applying a fiber reinforced plastics material capable of solidifying faster than said resin concrete on to said resin concrete to form a second reinforcing layer on said intermediate layer, said fiber reinforced plastics material forming said second reinforcing layer being applied before solidification of said resin concrete, whereby an incompletely cured molded product is obtained; and fully curing said molded product.
Claim 11
Independent Claim
119 words
A method of making a molded resin product comprising: . forming a first reinforcing layer on a mold from a fiber reinforced plastics material; applying resin concrete having a resin content in the range of from approximately 10 to 70%, and containing a hot curing composition on to said first reinforcing layer to form an intermediate layer thereon; applying a fiber reinforced plastics material capable of solidifying faster than said resin concrete on to said resin concrete to form a second reinforcing layer on said intermediate layer, said fiber reinforced plastics material forming said second reinforcing layer being applied before solidification of said resin concrete, whereby an incompletely cured molded product is obtained; and fully curing said molded product.
Claim 12
Independent Claim
95 words
A method of making a molded resin concrete product, comprising: forming a first'reinforcing layer on the male half of a mold from a fiber reinforced plastics material; forming a second reinforcing layer in the female half of said mold from a fiber reinforced plastics material; inserting said female half into said male half after solidification of said first and second reinforcing layers, whereby a concavity is defined between said first and second reinforcing layers; and pouring resin concrete having a resin content of about 10 to 70% into said concavity, and curing said resin concrete.
Claim 13
Independent Claim
95 words
A method of making a molded resin concrete product, comprising: forming a first'reinforcing layer on the male half of a mold from a fiber reinforced plastics material; forming a second reinforcing layer in the female half of said mold from a fiber reinforced plastics material; inserting said female half into said male half after solidification of said first and second reinforcing layers, whereby a concavity is defined between said first and second reinforcing layers; and pouring resin concrete having a resin content of about 10 to 70% into said concavity, and curing said resin concrete.
Claim 14
Dependent Claim
25 words
A method according to claim 9, wherein said resin concrete has a viscosity in the range of from approximately 300 to 1,000 poises at 25°C.
Claim 15
Dependent Claim
25 words
A method according to claim 10, wherein said resin concrete has a viscosity in the range of from approximately 50 to 1,000 poises at 25°C.
Claim 16
Independent Claim
17 words
A method according to any one of claims 9 to 12, wherein said product is a bathtub.
References Cited (Backward Citations)
No citation records indexed.
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