Thermosets

Acrylics

Polycarbonates

Artificial Marble

Grafting

Moisture Induced Crosslinking
Preforms

For each Topic, a report is continuously being prepared.  Each report contains Notes and abstracts of US Patents, Journal Articles and Review Articles.   A subscriber has access to all reports without addition charges. These reports are, also, available for a fee to non-subscribers.   For a listing of all available Topic Reports go to Subject Index or the Alphabetical Index.

The price for each report is $10 per Topic and Subtopic, payable through the Buy Now button above.  The annual subscription for individuals is $300.  Send a report request to cornelrd@bee.net  and the pages will be sent by email. By special request, printed copies can be sent by regular mail. (9/7/2011)

1/27/2012 Findings

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx   
Thermosets

1/3/2012
8,088,856 
Heat-curable resin composition  
Shiobara, Kashiwagi and Taguchi of Shen-Etsu Chemical, Japan, developed a heat-curable resin with excellent heat resistance and light resistance consisting of (A) 100 parts by weight isocyanuric acid derivative with an epoxy group, (B) 10 to 1000 parts silicone resin with an epoxy group, (C) an acid anhydride curing agent, (D) a curing accelerator and (E) 200 to 1,000 parts per 100 parts of (A), (B) and (C). an inorganic filler. (RDC 1/27/2012)

 “A thermosetting plastic, also known as a thermoset, is polymer material that irreversibly cures. The cure may be done through heat (generally above 200 °C (392 °F)), through a chemical reaction (two-part epoxy, for example), or irradiation such as electron beam processing.”

“Thermoset materials are usually liquid or malleable prior to curing and designed to be molded into their final form, or used as adhesives. Others are solids like that of the molding compound used in semiconductors and integrated circuits (IC). Once hardened a thermoset resin cannot be reheated and melted back to a liquid form.”

“According to IUPAC recommendation: A thermosetting polymer is a prepolymer in a soft solid or viscous state that changes irreversibly into an infusible, insoluble polymer network by curing. Curing can be induced by the action of heat or suitable radiation, or both. A cured thermosetting polymer is called a thermoset.”

(Wikipedia, Thermosets, 1/27/2012)

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx   Acrylics

1/3/2012
8,088,851 
Polyacrylate compositions  

8,088,850 
Polyacrylate compositions  
Lin et al of Henkel Corporation, Connecticut, developed a curable poly(acrylate) with improved resistance to shrinkage when exposed to hydrocarbon fluids, such as transmission fluids and oil-and fuel-based fluids.  This material includes a silyl functionalized acrylic and  a phenhylene diamine.  (RDC 1/27/2012)

“Poly(acrylate) compositions have excellent sealing and adhesive properties, and have many commercial uses. For instance, they can be formed into gaskets which are used extensively in the automotive industry or applied as conformal coatings in electronics applications.”

“In use, poly(acrylate) compositions may become exposed to a variety of conditions, including exposure to hydrocarbon fluids such as fuel oil or oil-containing products, transmission fluid, and other petroleum products. Poly(acrylate) compositions, however, frequently suffer from the drawback that they shrink when exposed to hydrocarbon fluids. Such volume shrinkage can occur, for example, due to the dissolution of additives such as plasticizers in the polyacrylates composition. A commercial incident of this event occurs within the engine, specifically the engine gaskets. If the engine gaskets shrink, fluids can start leaking from the engine, which is clearly not desirable. Accordingly, it would be desirable for a polyacrylate composition to be imparted with improved shrinkage-resistance.”

“Polyacrylates useful in such polyacrylate compositions are oftentimes quite viscous in nature, leading to difficulties in processing. Many diluents appear to be incompatible with such polyacrylates, in that they either solvate poorly at best (if at all), or they phase separate from the polyacrylates.”

[Lion et al, US Patent 8,088,850 (1/3/2012)]

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Polycarbonates

1/3/2012
8,088,849 
Scratch-resistant polycarbonate resin composition   
Jung et al of Cheil Industries, South Korea, developed a scratch-resistant polycarbonate resin consisting  (A) 100 parts by weight of a polycarbonate resin; (B) about 1 to 30 parts phosphate ester (C) 0.1 to 30 parts halogen substituted polycarbonate oligomer. The polycarbonate resin composition can have good transparency and flame retardancy, as well as anti-scratch, flowability and processability. (RDC 1/27/20120

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Artificial Marble

1/3/2012
8,088,489 
Artificial marble using low specific gravity material as chip and process for preparing the same  Oh of LG Chem, South Korea, developed an artificial marble using chips made of a low specific gravity material via a lamination or crunch technique to realize a natural stone-like texture.   In one example, a high specific gravity layer containing a high specific gravity inorganic filler is laminated on a low specific gravity layer made of a low specific gravity material to form a flat board, and then, the flat board is crushed to produce chips. In another example, low specific gravity regions made of a low specific gravity material is coated with a high specific gravity slurry containing a high specific gravity inorganic filler, to produce crunch chips. Thereby, a low specific gravity material, which could not be used conventionally, is applicable to the artificial marble, so as to achieve an outer appearance remarkably similar to a texture of natural marbles.  (RDC 1/27/2012)xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Grafting

1/3/2012
8,088,451 
Covalently functionalized particles for synthesis of new composite materials  
Timmons et al of the University of Texas, used gas phase plasma polymerization to covalently graft an organic molecule onto particles; covalently binding an organic monomer to the functionalized particles; and, polymerizing the organic monomers into hybrid polym

Grafting is the attaching of functional groups or molecular chains to other substances or materials by primary chemical bonds.  (RDC 1/27/2091)

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx  

Moisture Induced Crosslinking

1/3/2012
8,088,237 
Method for forming or curing polymer composites  
Haywood of Industrial Composites Engineering, Australia, cured composites in the presence of water vapor or steam at atmospheric pressure.   (RDC 1/27/2012)xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx  

Preforms