http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-2635691-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_bb0a7b16a31bf7bc8b903ed8b717aab6 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B1-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B1-041 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B1-04 |
| filingDate | 1976-08-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fb234f4d5704907fd5430e7b00752606 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_337d61e311a3448cdb7fcc54461ec5b0 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b315d815c3ab9c3890555c207ce8b605 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4192f46bdea1cf21f92cf7ba7e0f0b60 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8d1421da1f551e169ba91f8d5b628684 |
| publicationDate | 1978-02-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DE-2635691-A1 |
| titleOfInvention | THERMOPLASTICS FOR OPTICAL SYSTEMS |
| abstract | (Co)polymers of cyclohexylmethacrylate (I) are used as light diffracting materials for making optical systems, esp. lenses for camaras, projectors and other optical equipment. Esp. good results are obtd. using copolymers of (I) with 1-80 wt. %, esp. 10-70 wt. % of a comonomer contg. aromatic gps., such as styrene or phenylmethcrylate. Pref. copolymers have an intrinsic viscosity (THF at 25 degrees C) of 0.3 - 2.5 dl/g, esp. 0.4-1.0 dl/g, a refractive index nD = 1.50 - 1.58 and an Abbe' index vD = 61-32. The (co)polymers are clear, colourless transparent materials with the optical properties required for lens mfr., esp. refractive index, and have a low shrinkage, low coefft. of expansion, low water absorption and good thermal stability up to 80 degrees C. They can be processed as thermoplastics, which allows rationalised production techniques to be used for making the lenses etc. Due to the low water absorption, the resulting lenses retain their geometry in use better than lenses made of polymethymethacrylate. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-3605512-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0090558-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8197723-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2010144763-A3 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-102482423-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-102482423-B |
| priorityDate | 1976-08-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 88.