 Electrical connector containing adipic acid polyester sealant composition |
| What is claimed is: 1. A moisture-proof electrical connector for sealingly connecting transmission ... |
|
| Sealant compositions and sealed electrical connectors |
| OF PREFERRED EMBODIMENTS THE COMPOSITIONS The present invention provides sealant compositions ... |
|
| High voltage low current connector interface |
| The electrical connector of the present invention includes a first connector including a housing ... |
|
| Compound for pinhole-free rotational casting |
| What is claimed is: 1. An olefin polymer-based composition adaptable for use in rotational molding ... |
|
| Novel catalyst for producing relatively narrow molecular weight distribution olefin polymers |
| OF THE INVENTION The present invention is most advantageously practiced in a polymerization ... |
|
| Metal complex compounds |
| OF THE INVENTION The compounds of the present invention are prepared by combining: a) at least one ... |
|
| Hot-melt adhesive |
| OF PREFERRED EMBODIMENTS In accordance with the present invention, by performing a random ... |
|
| Preparation of addition polymerization catalysts via Lewis acid mitigated metal center oxidation |
| All reference to the Periodic Table of the Elements herein shall refer to the Periodic Table of ... |
|
| Crosslinkable polyethylene-based composition for rotational molding |
| OF THE INVENTION As indicated above, the present invention relates to a novel crosslinkable ... |
|
| Process for preparation of monocyclopentadienyl metal complex compounds and method of use |
| All reference to the Periodic Table of the Elements herein shall refer to the Periodic Table of ... |
|
|
Acrylic flexible light pipe of improved photo-thermal stability
| Details |
Inventors: Ilenda, Casmir Stanislaus; Johnson, Phelps Brian; Hallden-Abberton, Michael Paul;
Assignee: Fiberstors Incorporated (Solon, OH)
Primary Examiner: Wu; David W.
Assistant Examiner: Egwim; Kelechi C.
Attorney, Agent or Firm: Bruzga; Charles E.
Acrylic light pipe has adequate thermal and photo-thermal stability for many purposes, but is deficient in maintaining clarity, color, and good optical properties under conditions of exposure to high temperatures, especially in combination with exposure for lengthy periods to passage of light. Improved thermal stability, as reflected in reduced color formation, can be imparted by adjusting the polymerization conditions to produce the uncured core polymer of the core/clad construction with a much reduced terminal vinyl content, preferably below 0.5 vinyl groups/1000 monomer units. This process improvement, in combination with selected addition of a combination of certain hindered phenols and hydrolytically stable organic phosphites, together produce a substantial improvement in the resistance to discoloration under photo-thermal conditions, while maintaining the resistance to discoloration under thermal conditions. The known process conditions which do not yield lower terminal vinyl content, in combination with the selected additives, also produce acrylic light pipe with greatly improved photo-thermal stability. |
|
DETAILED DESCRIPTION We claim: 1.
A crosslinkable core mixture for a subsequently-cured composite which mixture contains a thermoplastic core polymer, the thermoplastic core polymer having a weight average molecular weight from about 2,000 to about 250,000 daltons, the core mixture comprising (a) a thermoplastic core polymer comprising i) from 80 to 99.
9 weight percent of polymerized units of a C.
sub.
1 -C.
sub.
18 alkyl acrylate or mixtures thereof with up to 50 weight percent of the components of (a)(i) of polymerized units of a C.
sub.
1 -C.
sub.
18 alkyl methacrylate; ii) from 0.
1 to 18.
2 weight percent of polymerized units of a functionally reactive monomer, and iii) from 0 to about 10 weight percent of polymerized units of a refractive index increasing monomer selected from styrene, benzyl acrylate, benzyl methacrylate, phenylethyl acrylate or phenylethyl methacrylate; iv) 0.
002 to 0.
3 weight percent residual molecules of or of decomposition products of an initiator of polymerization, including end groups on the thermoplastic core polymer; v) from 0.
2 to 2.
0 weight percent of residual molecules of or of decomposition products of a chain transfer agent, including end groups on the thermoplastic core polymer; (b) from 0.
1 to 10 weight percent, based on the crosslinkable core mixture weight, of a reactive additive; and (c) from 0.
01 to 1.
0 weight percent, based on the crosslinkable core mixture weight, of a stabilizer/antioxidant combination comprising 20-80 weight percent, based on the combination, of an organic phosphite which is hydrolytically stable and 80-20 weight percent, based on the combination, of a hindered phenol.
2.
The crosslinkable core mixture of claim 1, wherein the thermoplastic core polymer has a vinyl end-group content of below 0.
5 per 1000 monomer units.
3.
The crosslinkable core mixture of claim 1 or 2, further containing at least one fluorocarbon cladding polymer which surrounds the core mixture.
4.
The crosslinkable core mixture of claim 1 or 2 wherein the percentage of polymerized units of a C
|
|
Adhesives and Rubbers 
