US6180749B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass clear heavy gauge sheet with copolyester
Assignee: Kolon Industries Inc
•
Filing: 1998-11-02
•
Granted: 2001-01-30
•
Expires: 2018-11-02
Abstract
Abstract The present invention relates to a glass clear heavy gauge sheet with copolyester, having over than 83% of lights transmittance and lower than 5% of Haze, prepared by copolymer wherein polymerized [A] the acid ingredient component (i) terephthalate moiety as major component and (ii) essentially including 2,6-naphthalenedicarboxylate moiety, and (iii) selectively including isophthalate moiety with [B] the glycol component of (i) ethyleneglycol (EG) itself or (ii) the mixture of ethyleneglycol (EG) and 1,4-cyclohexandimethanol (CHDM). A glass clear heavy gauge sheet with copolyester of the present invention is suitable various industrial usages such as glass substitute of automobile, window glass substitute of high building, and transparent soundproof wall.
Inventors
- 👤 Kyeong Ah Kim
- 👤 Young Seok Kim
- 👤 Yong Cheol Shin
- 👤 Boung Kun Son
- 👤 Young Bum Kim
- 👤 Suck Jung Song
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:37
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/185; C08G63/187; C08G63/189; C08J2367/00; C08J2367/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
114 words
A heavy gauge clear glass sheet composed of copolyester resins having more than 83% of visible light transmittance and lower than 5% of haze, prepared from a copolymer polymerized with an acid component consisting of (i) a terephthalate moiety and a 2,6-naphthalene dicarboxylate moiety or (ii) a terephthalate moiety, a 2,6-naphthalene dicarboxylate moiety and an isophthalate moiety with glycol component comprising (i) ethyleneglycol (EG) itself, or (ii) the mixture of ethyleneglycol (EG) and 1,4-cyclohexandimethanol (CHDM), the aforesaid copolymer being (i) stable firmly so as not to decompose when melted; and (ii) having a high melt viscosity, such that when cooling there is no crystallization to deteriorate transparency, and the resins are of low crystallinity.
Claim 2
Dependent Claim
114 words
A heavy gauge clear glass sheet composed of copolyester resins having more than 83% of visible light transmittance and lower than 5% of haze, prepared from a copolymer polymerized with an acid component consisting of (i) a terephthalate moiety and a 2,6-naphthalene dicarboxylate moiety or (ii) a terephthalate moiety, a 2,6-naphthalene dicarboxylate moiety and an isophthalate moiety with glycol component comprising (i) ethyleneglycol (EG) itself, or (ii) the mixture of ethyleneglycol (EG) and 1,4-cyclohexandimethanol (CHDM), the aforesaid copolymer being (i) stable firmly so as not to decompose when melted; and (ii) having a high melt viscosity, such that when cooling there is no crystallization to deteriorate transparency, and the resins are of low crystallinity.
Claim 3
Dependent Claim
27 words
A heavy gauge clear glass sheet of copolyester resins prepared according to claim 1 , wherein the heat of cooling crystallization (ΔHme) is less than 1.0 J/g.
Claim 4
Dependent Claim
38 words
A heavy gauge clear glass sheet of copolyester resins prepared according to claim 1 , wherein the melt viscosity measured in shear rate of 100 sec.-1 at the temperature of 270° C. is from 1700 to 30,000 poise.
Claim 5
Dependent Claim
36 words
A heavy gauge clear glass sheet of copolyester prepared according to claim 1 , wherein the melt viscosity measured in shear rate of 1000 sec.-1 at the temperature of 270° C. is 900 to 8,000 poise.
Claim 6
Dependent Claim
21 words
A heavy gauge clear glass sheet of copolyester prepared according to claim 1 , wherein the thickness is over 1 mm.
Claim 7
Dependent Claim
26 words
A heavy gauge clear glass sheet of copolyester prepared according to claim 1 , wherein the refractive index of visible light is from 1.35 to 1.70.
Claim 8
Dependent Claim
25 words
A heavy gauge clear glass sheet of copolyester prepared according to claim 1 , wherein the terephthalate moiety comprises dimethylterephthalate (DMT) or terephthalic acid (TPA).
Claim 9
Dependent Claim
26 words
A heavy gauge clear glass sheet of copolyester prepared according to claim 1 , wherein the dicarboxylate moiety is either dimethyl-2,6-naphthalenedicarboxylate (NDC) or 2,6-naphthalenedicarboxyl acid (NDA).
Claim 10
Dependent Claim
25 words
A heavy gauge clear glass sheet of copolyester prepared according to claim 1 , wherein the isophthalate moiety is isophthalic acid (IPA) or dimethylisophthalate (DMI).
Claim 11
Dependent Claim
32 words
A heavy gauge clear glass sheet of copolyester prepared according to claim 1 , wherein the content of 2,6-napthalenedicarboxylate moiety is less than 20 mol % based upon the total acid 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) | 2004-01-30 | 2004-07-31 | 2005-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-01-30 | 2008-07-31 | 2009-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-01-30 | 2012-07-31 | 2013-01-30 | $7700.00 | Window Closed / Lapsed |