Composition, in particular a blocking agent composition for fixing blanks to ophthalmic or optical lenses

Patent metadata

Field	Value
Publication number	US-9340669-B2
Application number	US-201013390448-A
Country	US
Kind code	B2
Filing date	Aug 12, 2010
Priority date	Aug 14, 2009
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

The present invention relates to a composition, in particular a blocking agent composition, in particular for fixing blanks for ophthalmic and/or optical lenses, preferably plastics material-based ophthalmic spectacle glass blanks. The composition comprises a mixture containing (a) at least one polyol (polyalcohol) and (b) at least one organic polyester. In addition, the present invention relates to a method for producing a composite structure, which comprises a carrier having a blank fixed thereon, and the composite structure as such. Furthermore, the present invention relates to a method for producing spectacle glass, in particular plastics material-based spectacle glass, and the spectacle lenses that can be obtained therefrom. Finally, the present invention relates to the use of the composition according to the invention in the production of ophthalmic and optical lenses, and for fixing the blank to a carrier.

First claim

The invention claimed is:

1. A composition in the form of a blocking agent composition for fixing blanks for ophthalmic or optical lenses,
wherein the composition comprises a mixture,
wherein the mixture comprises:
(a) at least one polyol, wherein the polyol comprises units derived from bisphenol A and dimethylolpropionic acid, wherein the composition comprises the polyol in amounts of
 from 5 to 50% by weight, based on the composition, and
(b) at least one organic polyester, wherein (i) the polyester is selected from linear copolyesters comprising primary hydroxyl functionalities, and (ii) the composition comprises the organic polyester in amounts of from 50 to 95% by weight, based on the composition.

2. The composition as claimed in claim 1 , wherein the polyol has the following formula:

3. The composition as claimed in claim 1 , wherein the polyester has a molecular weight in the range from 1000 to 15 000 Daltons (Da) and wherein the polyester has a hydroxyl number in the range from 1 to 80 mg KOH/g.

4. The composition as claimed in claim 1 , wherein the polyester has a ring and ball softening point in the range from 40 to 90° C. and wherein the polyester has a glass transition temperature in the range from −70 to 40° C.

5. The composition as claimed in claim 1 , wherein the polyester has a melting range or a melting temperature in the range from 30 to 80° C.

6. A method for fixing blanks for ophthalmic or optical lenses, wherein
(a) firstly, the blank is arranged above or laterally to a carrier in such a way that the side or surface of the blank to be processed faces away from the carrier and in such a way that a fillable cavity results between the carrier on the one hand and the blank on the other hand;
(b) then the cavity is at least essentially completely filled with a composition as defined in claim 1 , which is liquefied or converted to a flowable state; and
(c) then the composition is cured or solidified to give a composite having the carrier with the blank fixed thereon by means of the composition as defined in claim 1 .

7. A composite having at least one carrier and also a blank, fixed to the carrier, for ophthalmic or optical lenses, wherein the blank is fixed to the carrier with a composition as defined in claim 1 .

8. A method for producing an ophthalmic or optical lens, wherein
(a) firstly, a blank for ophthalmic or optical lenses is arranged above or laterally to a carrier in such a way that the side or surface of the blank to be processed faces away from the carrier, and in such a way that a fillable cavity results between the carrier on the one hand and the blank on the other hand;
(b) then the cavity is at least essentially completely filled with a composition as defined in claim 1 , which is liquefied or converted to a flowable state;
(c) then the composition is cured or solidified to give a composite having the carrier with the blank fixed thereon by means of the composition; and
(d) finally, a processing of the blank fixed on the carrier takes place and, in this way, the ophthalmic or optical lens is obtained.

9. An ophthalmic or optical lens, the ophthalmic or optical lens being obtainable by a method as defined in claim 8 .

10. A composition in the form of a blocking agent composition for fixing blanks for ophthalmic or optical lenses,
wherein the composition comprises a mixture,
wherein the mixture comprises:
(a) at least one polyol, wherein the polyol comprises units derived from bisphenol A and dimethylolpropionic acid, wherein (i) the composition comprises the polyol in amounts of from 5 to 50% by weight, based on the composition, and (ii) the polyol has the following formula:

and
(b) at least one organic polyester, wherein (i) the polyester is selected from linear copolyesters comprising primary hydroxyl functionalities, and (ii) the composition comprises the organic polyester in amounts of from 50 to 95% by weight, based on the composition.

11. A composition in the form of a blocking agent composition for fixing blanks for ophthalmic or optical lenses,
wherein the composition comprises a mixture,
wherein the mixture comprises:
(a) at least one polyol, wherein (i) the polyol comprises units derived from bisphenol A and dimethylolpropionic acid, and (ii) the composition comprises the polyol in amounts of from 5 to 50% by weight, based on the composition, and (iii) the polyol has the following formula:

and
(b) at least one organic polyester, wherein (i) the polyester is selected from linear copolyesters comprising primary hydroxyl functionalities, (ii) the composition comprises the organic polyester in amounts of from 50 to 95% by weight, based on the composition, (iii) the polyester has a molecular weight in the range from 1000 to 15 000 Daltons (Da) and (iv) the polyester has a hydroxyl number in the range from 1 to 80 mg KOH/g.

12. A composition in the form of a blocking agent composition for fixing blanks for ophthalmic or optical lenses,
wherein the composition comprises a mixture,
wherein the mixture comprises:
(a) at least one polyol, wherein the polyol comprises units derived from bisphenol A and dimethylolpropionic acid, wherein (i) the composition comprises the polyol in amounts of from 5 to 50% by weight, based on the composition, and (ii) the polyol has the following formula:

and
(b) at least one organic polyester, wherein the polyester is selected from linear copolyesters comprising primary hydroxyl functionalities, wherein (i) the composition comprises the organic polyester in amounts of from 50 to 95% by weight, based on the composition, (ii) the polyester has a ring and ball softening point in the range from 40 to 90° C. and (iii) the polyester has a glass transition temperature in the range from −70 to 40° C.

13. A composition in the form of a blocking agent composition for fixing blanks for ophthalmic or optical lenses,
wherein the composition comprises a mixture,
wherein the mixture comprises:
(a) at least one polyol, wherein the polyol comprises units derived from bisphenol A and dimethylolpropionic acid, wherein (i) the composition comprises the polyol in amounts of from 5 to 50% by weight, based on the composition, and (ii) the polyol has the following formula:

and
(b) at least one organic polyester, wherein the polyester is selected from linear copolyesters comprising primary hydroxyl functionalities, wherein (i) the composition comprises the organic polyester in amounts of from 50 to 95% by weight, based on the composition, and (ii) the polyester has a melting range or melting temperature in the range from 30 to 80° C.

14. A composition in the form of a blocking agent composition for fixing blanks for ophthalmic or optical lenses,
wherein the composition comprises a mixture,
wherein the mixture comprises:
(a) at least one polyol, wherein the polyol comprises units derived from bisphenol A and dimethylolpropionic acid, wherein (i) the composition comprises the polyol in amounts of from 5 to 50% by weight, based on the composition, and (ii) the polyol has the following formula:

Assignees

• Schneider Gunter
• Huttenhuis Stephan
• Achenbach Ferdinand
• Schneider Gmbh & Co Kg

Inventors

• Schneider Gunter
• Huttenhuis Stephan
• Achenbach Ferdinand

Classifications

• B24B13/005

  Blocking means, chucks or the like; Alignment devices · CPC title

• Y10T428/31786

  Of polyester [e.g., alkyd, etc.] · CPC title

• B29D11/00942

  where the lens material is mounted in a support for mounting onto a cutting device, e.g. a lathe, and where the support is of machinable material, e.g. plastics · CPC title

• B24B13/0057

  Deblocking of lenses · CPC title

• G02B7/025

  using glue · CPC title