US5406641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible light pipe, cured composite and processes for preparation thereof
Assignee: Energy Focus Inc
•
Filing: 1993-06-15
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Granted: 1995-04-11
•
Expires: 2013-06-15
Abstract
Abstract Process for cured composites and flexible light pipe, in which a molten cladding polymer and a crosslinkable core mixture are coaxially extruded through a coextrusion die, the cladding is filled with the crosslinkable core mixture, and the crosslinkable core mixture is cured within the cladding.
Inventors
- 👤 Andrew B. W. Bigley, Jr.
- 👤 Jeffrey L. Daecher
- 👤 Norman L. Holy
- 👤 Robert E. Jerman
- 👤 Phelps B. Johnson
- 👤 William J. Work
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:07
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00663; B29C; B29C48/00; B29C48/03; B29C48/06; B29C48/09; B29C48/10; B29C48/25; B29C48/30; B29C48/304; B29C48/88; B29C48/90; B29C48/908; B29C48/91; B29C48/919; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0822; B29C48/022; B29C48/32; B29C48/34; B29C48/911; B29C69/00; B29K; B29K2033/00; B29K2033/04; B29K2033/08; B29K2105/00; B29K2105/0085; B29K2105/24; B29K2105/246; B29K2301/00; B29K2301/10; B29L; B29L2011/00; B29L2011/0075
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
126 words
A process for producing a cured composite comprising the steps of: a) concurrently and coaxially extruding: i.) a molten cladding polymer through an annular channel of a coextrusion die to form an extruded tubular cladding, and ii.) a synthesized crosslinkable core mixture comprising from about 72 to about 99.8 weight percent C 1 -C 18 alkyl acrylates, through a core mixture delivery tube of the coextrusion die to form an extruded crosslinkable core mixture within the circumference of the extruded tubular cladding; b) filling and contacting the extruded tubular cladding with the extruded crosslinkable core mixture after exiting the coextrusion die; and c) curing the crosslinkable core mixture within the tubular cladding after filling and contacting the extruded tubular cladding with the extruded crosslinkable core mixture.
Claim 2
Dependent Claim
126 words
A process for producing a cured composite comprising the steps of: a) concurrently and coaxially extruding: i.) a molten cladding polymer through an annular channel of a coextrusion die to form an extruded tubular cladding, and ii.) a synthesized crosslinkable core mixture comprising from about 72 to about 99.8 weight percent C 1 -C 18 alkyl acrylates, through a core mixture delivery tube of the coextrusion die to form an extruded crosslinkable core mixture within the circumference of the extruded tubular cladding; b) filling and contacting the extruded tubular cladding with the extruded crosslinkable core mixture after exiting the coextrusion die; and c) curing the crosslinkable core mixture within the tubular cladding after filling and contacting the extruded tubular cladding with the extruded crosslinkable core mixture.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein steps a), b) and c) are continuous.
Claim 4
Dependent Claim
147 words
A process for producing light pipe comprising the steps of: a) concurrently and coaxially extruding: i.) a molten fluoropolymer through an annular channel of a coextrusion die to form an extruded tubular fluoropolymer cladding, and ii.) a synthesized crosslinkable core mixture comprising from about 72 to about 99.8 weight percent C 1 -C 18 alkyl acrylates, through a core mixture delivery tube of the coextrusion die to form an extruded crosslinkable core mixture within the circumference of the extruded tubular fluoropolymer cladding; b) filling and contacting of the extruded tubular fluoropolymer cladding with the extruded crosslinkable core mixture after exiting the coextrusion die; and c) curing the extruded crosslinkable core mixture within the extruded tubular fluoropolymer cladding wherein the cured extruded crosslinkable core mixture and the extruded tubular fluoropolymer cladding are in substantially complete contact after filling the extruded tubular cladding with the extruded crosslinkable core mixture.
Claim 5
Dependent Claim
147 words
A process for producing light pipe comprising the steps of: a) concurrently and coaxially extruding: i.) a molten fluoropolymer through an annular channel of a coextrusion die to form an extruded tubular fluoropolymer cladding, and ii.) a synthesized crosslinkable core mixture comprising from about 72 to about 99.8 weight percent C 1 -C 18 alkyl acrylates, through a core mixture delivery tube of the coextrusion die to form an extruded crosslinkable core mixture within the circumference of the extruded tubular fluoropolymer cladding; b) filling and contacting of the extruded tubular fluoropolymer cladding with the extruded crosslinkable core mixture after exiting the coextrusion die; and c) curing the extruded crosslinkable core mixture within the extruded tubular fluoropolymer cladding wherein the cured extruded crosslinkable core mixture and the extruded tubular fluoropolymer cladding are in substantially complete contact after filling the extruded tubular cladding with the extruded crosslinkable core mixture.
Claim 6
Dependent Claim
13 words
The process of claim 3 wherein steps a), b) and c) are continuous.
Claim 7
Dependent Claim
157 words
The process of claim 4 wherein the crosslinkable core mixture comprises: a) from about 90 to about 99.9 weight percent, based on the crosslinkable core mixture weight, of an uncrosslinked copolymer having weight average molecular weight from about 2,000 to about 250,000 daltons, the uncrosslinked copolymer comprising: i) from about 80 to about 99.9 weight percent based on the uncrosslinked copolymer weight, of C 1 -C 18 alkyl acrylates selected from methyl acrylate, ethyl acrylate, normal butyl acrylate, 2-ethylhexyl acrylate or mixtures thereof, ii) front about 0.1 to about 20 weight percent, based on the uncrosslinked copolymer weight, of a functionally reactive monomer, and iii) from 0 to about 10 weight percent, based on the uncrosslinked copolymer weight, of a refractive index increasing monomer selected from styrene, benzyl acrylate, benzyl methacrylate, phenylethyl acrylate or phenylethyl methacrylate; and b) from about 0.1 to about 10 weight percent, based on the crosslinkable core mixture weight, of a reactive additive.
Claim 8
Dependent Claim
62 words
The process of claim 5 wherein a) the uncrosslinked copolymer molecular weight is from about 10,000 to about 150,000 daltons; b) the functionally reactive monomer is selected from hydroxyethyl acrylate, hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, or mixtures of these; and c) the reactive additive is selected from a diglycidyl ether, a dilactone, an aliphatic diisocyanate, a polycarboxylic acid, or an anhydride.
Claim 9
Dependent Claim
49 words
The process of claim 5 wherein a) the uncrosslinked copolymer molecular weight is from about 10,000 to about 150,000 daltons; b) the functionally reactive monomer is glycidyl acrylate or glycidyl methacrylate; and c) the reactive additive is selected from an anhydride, a polycarboxylic acid, a diol or a polyol.
Claim 10
Dependent Claim
65 words
The process of claim 5 wherein a) the uncrosslinked copolymer molecular weight is from about 10,000 to about 150,000 daltons; b) the functionally reactive monomer is used at a level of from about 0.5 to about 12 weight percent and is selected from 2-methacryloxyethyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, or mixtures of these; and c) the reactive additive is water and a silane condensation reaction catalyst.
Claim 11
Dependent Claim
44 words
The process of claim 8 wherein a) the bulk monomer unit is methyl acrylate, ethyl acrylate, or normal butyl acrylate, or mixtures of these; b) the functionally reactive monomer is 3-methacryloxypropyltrimethoxysilane or vinyltrimethoxysilane; and c) the silane condensation reaction catalyst is a dialkyltin dicarboxylate.
Claim 12
Dependent Claim
42 words
The process of claim 9 further wherein the uncrosslinked copolymer is derived from about 94 to about 98 weight percent ethyl acrylate and from about 2 to about 6 weight percent of 3-methacryloxypropyltrimethoxysilane, and the silane condensation reaction catalyst is dibutyltin diacetate.
Claim 13
Dependent Claim
35 words
The process of claim 1 further comprising the step of sheathing the extruded tubular cladding with a sheathing polymer simultaneously with, or subsequently to, filling the extruded tubular cladding with the extruded crosslinkable core mixture.
Claim 14
Dependent Claim
37 words
The process of claim 3 further comprising the step of sheathing the extruded tubular fluoropolymer cladding with a sheathing polymer simultaneously with, or subsequently to, filling the extruded tubular fluoropolymer cladding with the extruded crosslinkable core mixture.
Claim 15
Dependent Claim
30 words
The process of claim 3 wherein an exit outside diameter of the core mixture delivery tube is from about 1 to about 4 times a diameter of the cured core.
Claim 16
Dependent Claim
29 words
The process of claim 3 wherein an inside diameter of the core mixture delivery robe is from about 0.75 to about 3 times a diameter of the cured core.
Claim 17
Dependent Claim
32 words
The process of claim 3 wherein the coextrusion die has an annular channel exit gap width of from about 1 to about 20 times a thickness of the extruded tubular fluoropolymer cladding.
Claim 18
Dependent Claim
33 words
The process of claim 3 having a distance between a cooling bath surface and an exit of the core mixture delivery tube of less than 20 times a diameter of the cured core.
Claim 19
Dependent Claim
32 words
The process of claim 3 having a distance between an outer die block and a cooling bath surface of from about 1 to about 20 times a diameter of the cured core.
Claim 20
Dependent Claim
28 words
The process of claim 3 wherein the coextrusion die has an annular channel diameter of from about 1 to about 15 times a diameter of the cured core.
Claim 21
Dependent Claim
11 words
A flexible light pipe product by the process of claim 3.
Claim 22
Dependent Claim
65 words
A flexible light pipe product by the process of claim 3 having good light transmittance, wherein the diffuse white light transmission loss is less than or equal to 1.0 decibel per meter, and wherein the differential transmission loss between light wavelengths of 400 nm to 600 nm is equal to or less than 1.0 decibel per meter as measured by a "cut-back" interference filter method.
Claim 23
Dependent Claim
61 words
A flexible light pipe product by the process of claim 3 having good thermal stability, wherein a change in the differential transmission loss between light wavelengths of 400 nm to 600 nm is equal to or less than 0.5 decibel per meter after 50 days of exposure to a temperature of 90° C., as measured by a non-destructive interference filter method.
Claim 24
Dependent Claim
46 words
A flexible light pipe product by the process of claim 3 having good flexibility, wherein the product, at 20° C., survives without core fracture a 180° bend at a bend radius which is less than or equal to five times the diameter of the cured core.
Claim 25
Dependent Claim
35 words
A flexible light pipe product by the process of claim 3 wherein the product has good hardness properties, wherein the Shore "A" hardness is less than 90 after 50 days of exposure at 120° C.
Claim 26
Dependent Claim
154 words
A flexible light pipe product by the process of claim 3 wherein the product has good light transmittance wherein the differential transmission loss between light wavelengths of 400 nm to 600 nm is equal to or less than 1.0 decibel per meter as measured by a "cut-back" interference filter method; good thermal stability, wherein a change in the differential transmission loss between light wavelengths of 400 nm to 600 nm is equal to or less than 0.5 decibel per meter after 50 days of exposure to a temperature of 90° C., as measured by a non-destructive interference filter method; good flexibility, wherein the product, at 20° C., survives without core fracture a 180° bend at a bend radius which is less than or equal to five times the diameter of the cured core; and good hardness properties, wherein the Shore "A" hardness is less than 90 after 50 days of exposure at 120° C.
References Cited (Backward Citations)
GB1143689A
Cited
US3453230A
Cited
GB1037498A
Cited
US3641332A
Cited
US4133664A
Cited
JPS5360242A
Cited
US4161500A
Cited
US4380367A
Cited
US4431264A
Cited
US4381269A
Cited
US4422719A
Cited
JPS5816163A
Cited
US4681400A
Cited
US4505543A
Cited
US4466697A
Cited
US4576438A
Cited
US4543403A
Cited
JPS6118450A
Cited
JPS6134504A
Cited
US4708833A
Cited
EP0228495A1
Cited
US4828359A
Cited
US5122580A
Cited
US5225166A
Cited
US4763984A
Cited
JPS63274903A
Cited
JPH01219802A
Cited
US4919513A
Cited
US5146535A
Cited
US4957347A
Cited
EP0381461A2
Cited
US5052778A
Cited
US5221387A
Cited
US5149467A
Cited
GB2234086A
Cited
JPH03107904A
Cited
JPH03180804A
Cited
US5067831A
Cited
US5111526A
Cited
JPH03241302A
Cited
JPH03259202A
Cited
EP0469673A1
Cited
JPH04350812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-10 | 1998-10-10 | 1999-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-10 | 2002-10-10 | 2003-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-10 | 2006-10-10 | 2007-04-11 | $7700.00 | Window Closed / Lapsed |