Abstract: A process to form a block copolymer comprising two or more regions or segments of differentiated polymer composition or properties, including feeding a first mixture that includes a chain shuttling agent, a solvent, the one or more monomers, and optionally hydrogen into a first reactor or reactor zone, feeding a second mixture that includes at least one olefin polymerization catalyst and at least one cocatalyst into the first reactor or reactor zone, contacting the first mixture and the second mixture under polymerization conditions in the first reactor or reactor zone to form a reaction mixture that is characterized by the formation of polymer chains from the monomers, allowing polymerization to occur in the first reactor or reactor zone and/or a second reactor or reactor zone to form polymer chains that are differentiated from the polymer chains, such that the resultant polymer has two or more chemically or physically distinguishable blocks.

Abstract: A process to form a block copolymer comprising two or more regions or segments of differentiated polymer composition or properties, including feeding a first mixture that includes a chain shuttling agent, a solvent, the one or more monomers, and optionally hydrogen into a first reactor or reactor zone, feeding a second mixture that includes at least one olefin polymerization catalyst and at least one cocatalyst into the first reactor or reactor zone, contacting the first mixture and the second mixture under polymerization conditions in the first reactor or reactor zone to form a reaction mixture that is characterized by the formation of polymer chains from the monomers, allowing polymerization to occur in the first reactor or reactor zone and/or a second reactor or reactor zone to form polymer chains that are differentiated from the polymer chains, such that the resultant polymer has two or more chemically or physically distinguishable blocks.

Abstract: The present invention relates to porous or breathable film compositions and processes for producing such compositions. The porous or breathable films preferably comprise a polyolefin. Said films are useful in many applications including bags for packaging cement.

Abstract: A method for vaporizing the refrigerant trapped in the oil reservoir of a hermetic compressor. The refrigerant is vaporized by heat from a small pill shaped PTC heater (positive temperature coefficient heater) simply attached with adhesive tape in a shallow depression disposed near the bottom of the reservoir. The depression, formed on the compressor shell as a seamless indentation, extends into the reservoir and has a concave shape that conforms to the external surface of the heater. This provides a strong and hermetically sealed integral heater fixture having close fitting heat conductive contact with its associated heater element. The heater, being disposed in the shallow indentation, is placed in more direct contact with the liquid refrigerant, which tends to settle at the bottom of the reservoir due to its density being greater than that of the oil.