US4418113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforcing mat for fiber reinforced plastic material
Assignee: Asahi Fiber Glass Co Ltd
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Filing: 1982-08-02
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Granted: 1983-11-29
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Expires: 2002-08-02
Abstract
Abstract A reinforcing mat for fiber reinforced plastic material comprises a first layer of longer glass fiber strands which are formed by collecting at least 300 glass fibers and are arranged in a non-directional and curled state and a second layer of shorter glass strands arranged in a non-directional state which has a thickness smaller than said first layer, said glass fiber strands of each layer being bonded with a binder.
Inventors
- 👤 Sadao Kawashima
- 👤 Chiharu Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:20
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/06; B29C70/08; B29C70/081; B29C70/10; B29C70/12; B29C70/16; B29C70/18; B32; B32B; B32B27/00; B32B27/06; B32B27/36; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0854; B29K2709/00; B29K2709/08; B32B2262/00; B32B2262/10; B32B2262/101; B32B2305/00; B32B2305/08; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/627; Y10T442/631; Y10T442/659; Y10T442/67
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
149 words
A reinforcing mat for fiber reinforced plastic material to be manufactured by the hand-layup process, which consists essentially of: a first layer of curled glass fiber strands arranged in a non-directional manner in the layer, each strand being formed of a collection of at least 300 glass filaments and each having a length of more than 60 cm and the density of said first layer being in a range of from 400 g/m 2 to 1500 g/m 2 ; a second layer, thinner than said first layer, of glass fiber strands arranged in a non-directional manner on said first layer, the length of the strands being in a range of from 2 cm to 15 cm and the density of said second layer being in a range of from 50 g/m 2 to 500 g/m 2 ; and a polyester binder for bonding said first and said second layers.
Claim 2
Dependent Claim
149 words
A reinforcing mat for fiber reinforced plastic material to be manufactured by the hand-layup process, which consists essentially of: a first layer of curled glass fiber strands arranged in a non-directional manner in the layer, each strand being formed of a collection of at least 300 glass filaments and each having a length of more than 60 cm and the density of said first layer being in a range of from 400 g/m 2 to 1500 g/m 2 ; a second layer, thinner than said first layer, of glass fiber strands arranged in a non-directional manner on said first layer, the length of the strands being in a range of from 2 cm to 15 cm and the density of said second layer being in a range of from 50 g/m 2 to 500 g/m 2 ; and a polyester binder for bonding said first and said second layers.
Claim 3
Dependent Claim
31 words
The reinforcing mat of claim 1, wherein the strand from which the curled glass fiber mass of said first layer is formed, is a collection of less than 1200 glass filaments.
Claim 4
Dependent Claim
27 words
The reinforcing mat of claim 1, wherein the lengths of the strands of said second layer fall within the range of from 3 cm to 10 cm.
Claim 5
Dependent Claim
38 words
The reinforcing mat of claim 1, wherein the glass strands of said first and second layers are formed by bonding glass filaments together with a sizing agent which is not dissolved by styrene for at least 20 seconds.
Claim 6
Dependent Claim
17 words
The reinforcing mat of claim 4, wherein said sizing agent is dissolved by styrene within 240 seconds.
Claim 7
Dependent Claim
27 words
The reinforcing mat of claim 1, wherein the density of the curled glass fiber strands in said first layer ranges from 600 to 1500 g/m 2 .
Claim 8
Dependent Claim
43 words
The reinforcing mat of claim 1, wherein said sizing agent is an emulsion of a homopolymer of vinyl acetate or a graft copolymer of vinyl acetate-PVA having a low PVA content, or having a low polymerization degree of PVA as a main component.
Claim 9
Dependent Claim
187 words
A process for preparing a reinforcing mat for fiber reinforced plastic material to be manufactured by the hand-layup process, which comprises: applying to glass filaments a sizing agent and gathering the glass filaments into a strand; accumulating a large number of said strands in a curled and non-directional manner to form a first layer, each strand of said first layer being formed by a collection of at least 300 glass filaments having a length of more than 60 cm and the density of said first layer being in a range of from 400 g/m 2 to 1500 g/m 2 ; applying to glass filaments a sizing agent and gathering the glass filaments into a strand; accumulating a large number of said strands in a non-directional manner to form a second layer, said second layer being thinner than said first layer, the length of the strands being in a range from 2 cm to 15 cm and the density of said second layer being in a range of from 50 g/m 2 to 500 g/m 2 ; and bonding said first and second layers by a polyester binder.
Claim 10
Dependent Claim
187 words
A process for preparing a reinforcing mat for fiber reinforced plastic material to be manufactured by the hand-layup process, which comprises: applying to glass filaments a sizing agent and gathering the glass filaments into a strand; accumulating a large number of said strands in a curled and non-directional manner to form a first layer, each strand of said first layer being formed by a collection of at least 300 glass filaments having a length of more than 60 cm and the density of said first layer being in a range of from 400 g/m 2 to 1500 g/m 2 ; applying to glass filaments a sizing agent and gathering the glass filaments into a strand; accumulating a large number of said strands in a non-directional manner to form a second layer, said second layer being thinner than said first layer, the length of the strands being in a range from 2 cm to 15 cm and the density of said second layer being in a range of from 50 g/m 2 to 500 g/m 2 ; and bonding said first and second layers by a polyester binder.
Claim 11
Dependent Claim
22 words
The process of claim 8, wherein said sizing agent is dissolved by styrene in a time ranging from 20 to 240 seconds.
Claim 12
Dependent Claim
27 words
The process of claim 8, wherein the density of the curled glass strands in said first layer ranges from 600 g/m 2 to 1500 g/m 2 .
Claim 13
Dependent Claim
23 words
The process of claim 8, wherein the strands of said first layer are formed of a collection of less than 1200 glass filaments.
Claim 14
Dependent Claim
27 words
The process of claim 8, wherein the lengths of the glass strands in said second layer are in the range of from 3 cm to 10 cm.
Claim 15
Dependent Claim
42 words
The process of claim 8, wherein said sizing agent is an emulsion of a homopolymer of vinyl acetate or a graft copolymer of vinyl acetate-PVA having a low PVA content, or having a low polymerization degree of PVA as a main component.
Claim 16
Independent Claim
211 words
A method of manufacturing a fiber reinforced plastic material by the hand-layup process, which comprises: forming a composite mat by bonding, using a polyester binder, a first layer of curled glass fiber strands arranged in a non-directional manner in the layer, each strand being formed of a collection of at least 300 glass filaments and having a length of more than 60 cm and the density of said first layer being in the range of from 400 g/m 2 to 1500 g/m 2 and a second layer, thinner than said first layer, of glass fiber strands arranged in a non-directional manner on said first layer, the length of the strands being in the range of from 2 cm to 15 cm and the density of said second layer being in the range of from 50 g/m 2 to 500 g/m 2 , the glass strands of said first and second layers being formed by bonding glass filaments together with a sizing agent which is dissolved by styrene; impregnating said composite mat with liquid unsaturated polyester resin to give a uniform distribution of the resin in said composite mat; and applying a rolling operation to filamentize and crush the strands of said composite mat after said sizing agent is dissolved by styrene.
Claim 17
Independent Claim
211 words
A method of manufacturing a fiber reinforced plastic material by the hand-layup process, which comprises: forming a composite mat by bonding, using a polyester binder, a first layer of curled glass fiber strands arranged in a non-directional manner in the layer, each strand being formed of a collection of at least 300 glass filaments and having a length of more than 60 cm and the density of said first layer being in the range of from 400 g/m 2 to 1500 g/m 2 and a second layer, thinner than said first layer, of glass fiber strands arranged in a non-directional manner on said first layer, the length of the strands being in the range of from 2 cm to 15 cm and the density of said second layer being in the range of from 50 g/m 2 to 500 g/m 2 , the glass strands of said first and second layers being formed by bonding glass filaments together with a sizing agent which is dissolved by styrene; impregnating said composite mat with liquid unsaturated polyester resin to give a uniform distribution of the resin in said composite mat; and applying a rolling operation to filamentize and crush the strands of said composite mat after said sizing agent is dissolved by styrene.
Claim 18
Dependent Claim
23 words
The method of claim 14, wherein said sizing agent is dissolved by styrene over a time ranging from 20 seconds to 240 seconds.
Claim 19
Dependent Claim
23 words
The method of claim 14, wherein the strands of said first layer are formed of a collection of less than 1200 glass filaments.
Claim 20
Dependent Claim
26 words
The method of claim 14, wherein the length of the strands of said second layer are within the range of from 3 cm to 10 cm.
Claim 21
Dependent Claim
42 words
The method of claim 14, wherein the sizing agent is an emulsion of a homopolymer of vinyl acetate or a graft copolymer of vinyl acetate-PVA having a low PVA content, or having a low polymerization degree of PVA as a main component.
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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |