EP0044911A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Infrared absorbing polycarbonate eye protective lens
Assignee: Wyeth Holdings LLC
•
Filing: 1981-05-12
•
Granted: —
•
Expires: 2001-05-12
Abstract
Abstract infrared-absorbing polycarbonate eye protective lenses are prepared from a polycarbonate resin having a meltflow value of about 12 to 120 and being substantially free of acidic and basic impurities and a bis(p-dialkylaminophenyl) [N,N-bis(p-dialkylaminophenyl)-p-aminophenyl]-aminium salt.
Inventors
- 👤 Robert J. Tucker
- 👤 Willard C. White
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 19:28
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
An infrared absorbing eye protective lens comprising a polycarbonate resin having a meltflow value of about 12 to 120 and being substantially free of acidic and basic impurities, and an effective infrared-absorbing amount of a bis-(p-dialkylaminophenyl)[N,N-bis(p-dialkylaminophenyl)p-aminophenyl]aminium salt represented by the formula: wherein R and R' are individually C 1 -C 4 alkyl groups and X - is. an anion selected from perchlorate, hexafluoroantimonate, hexafluoroarsenate, fluoroborate, trichloroacetate and trifluoroacetate; said lens exhibiting a transmittance of infrared radiation in the region 700 to 2800 nanometers not exceeding 25 percent, and having a luminous transmittance of from about .00027'to about 82 percent, and wherein the lens optionally contains an ultraviolet ray absorber and/ or a green dye.
Claim 2
Dependent Claim
114 words
An infrared absorbing eye protective lens comprising a polycarbonate resin having a meltflow value of about 12 to 120 and being substantially free of acidic and basic impurities, and an effective infrared-absorbing amount of a bis-(p-dialkylaminophenyl)[N,N-bis(p-dialkylaminophenyl)p-aminophenyl]aminium salt represented by the formula: wherein R and R' are individually C 1 -C 4 alkyl groups and X - is. an anion selected from perchlorate, hexafluoroantimonate, hexafluoroarsenate, fluoroborate, trichloroacetate and trifluoroacetate; said lens exhibiting a transmittance of infrared radiation in the region 700 to 2800 nanometers not exceeding 25 percent, and having a luminous transmittance of from about .00027'to about 82 percent, and wherein the lens optionally contains an ultraviolet ray absorber and/ or a green dye.
Claim 3
Dependent Claim
13 words
the lens of Claim 1 wherein said aminium salt is bis(p-di-n-butylaminophenyl) [N,N-bis(p-di-n--butylaminophenyl)-p-aminophenyl]aminium hexafluoroantimonate.
Claim 4
Dependent Claim
20 words
The lens of Claim 1 or Claim 2 wherein said ultraviolet ray absorber compound is present and is 2,4--diacetoxybenzoic acid.
Claim 5
Dependent Claim
18 words
The lens of Claim 1 wherein said green dye is present and is C. I. Acid Green 25.
Claim 6
Dependent Claim
47 words
The lens of Claim 1 wherein the aminium salt is prepared in situ from an essentially equimolar mixture of and wherein R and R' are individually C 1 -C 4 alkyl groups and X - is an anion selected from perchlorate, hexafluoroantimonate, hexafluoroarsenate, fluoroborate, trichloroacetate and trifluoroacetate.
Claim 7
Dependent Claim
60 words
A composition comprising a polycarbonate resin having a meltflow value of about 12 to 120 and being substantially free of acidic and basic impurities and a bis(p-' dialkylaminophenyl)[N,N-bis(p-dialkylaminophenyl) - p-aminophenyl]aminium salt of the formula wherein R and R' are individually C 1 -C 4 alkyl groups and X is an anion selected from perchlorate, hexafluoroantimonate, hexafluoroarsenate, fluoroborate, trichloroacetate and trifluoroacetate.
Claim 8
Dependent Claim
60 words
A composition comprising a polycarbonate resin having a meltflow value of about 12 to 120 and being substantially free of acidic and basic impurities and a bis(p-' dialkylaminophenyl)[N,N-bis(p-dialkylaminophenyl) - p-aminophenyl]aminium salt of the formula wherein R and R' are individually C 1 -C 4 alkyl groups and X is an anion selected from perchlorate, hexafluoroantimonate, hexafluoroarsenate, fluoroborate, trichloroacetate and trifluoroacetate.
Claim 9
Dependent Claim
12 words
The composition of Claim 6 further containing an ultraviolet ray absorber compound.
Claim 10
Dependent Claim
14 words
The composition of Claim 7 wherein the ultraviolet ray absorber compound is 2,4-diacetoxybenzoic acid.
Claim 11
Dependent Claim
19 words
The composition of Claim 6 or Claim 8 wherein each R and R' is n-butyl and X is hexafluoroantimonate.
Claim 12
Dependent Claim
47 words
The composition of Claim 6 wherein the aminium salt is prepared in situ from an essentially equimolar mixture of and wherein R and R' are individually C 1 -C 4 alkyl groups and X - is an anion selected from perchlorate, hexafluoroantimonate, hexafluoroarsenate, fluoroborate, trichloroacetate and trifluoroacetate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.