To provide a protein adsorption preventing agent having an excellent film forming property and excellent water solubility, capable of easily coating various substrates, and having an excellent protein adsorption preventing property, and also to provide a protein adsorption preventing film using the protein adsorption preventing agent and a medical tool including the protein adsorption preventing film. A protein adsorption preventing agent containing an aqueous solvent and a polymer having at least a structural unit (A) represented by the following formula (1) (wherein R.sup.1 represents a methyl group or an ethyl group and n represents an integer of 1 to 10), and further containing a hydrophobic group, a protein adsorption preventing film using the protein adsorption preventing agent, and a medical tool including the protein adsorption preventing film. ##STR00001##

To provide a protein adsorption preventing agent having an excellent film forming property and excellent water solubility, capable of easily coating various substrates, and having an excellent protein adsorption preventing property, and also to provide a protein adsorption preventing film using the protein adsorption preventing agent and a medical tool including the protein adsorption preventing film. A protein adsorption preventing agent containing an aqueous solvent and a polymer having at least a structural unit (A) represented by the following formula (1) (wherein R.sup.1 represents a methyl group or an ethyl group and n represents an integer of 1 to 10), and further containing a hydrophobic group, a protein adsorption preventing film using the protein adsorption preventing agent, and a medical tool including the protein adsorption preventing film. ##STR00001##

A polypropylene-based resin composition containing: 5 to 47 parts by mass of a propylene-based polymer (A) having an MFR of 50 to 150 g/10 min and an amount of a decane-soluble portion of 6 to 15% by mass, 20 to 30 parts by mass of a propylene homopolymer (B) having an MFR of 10 to 500 g/10 min, 23 to 30 parts by mass of an ethylene/-olefin copolymer (C) being a random copolymer of ethylene and an -olefin having 4 to 8 carbon atoms, and having a density of 0.850 to 0.880 g/cm.sup.3, an MFR of 0.5 to 30 g/10 min, and a melting point peak of 110 C. or more, and 30 to 40 parts by mass of an inorganic filler (D), provided that a total amount of the components (A) to (D) is 100 parts by mass.

Compounds and compositions are provided which are useful in additive printing, particularly additive printing techniques such as stereolithography (SLA) wherein a macromer is photopolymerized to form a manufactured article. Representative compounds comprise a polyaxial central core (CC) and 2-4 arms of the formula (A)-(B) or (B)-(A) extending from the central core, where at least one of the arms comprise a light-reactive functional group (Q) and (A) is the free-radical polymerization product from monomers selected from trimethylene carbonate (T) and -caprolactone (C), while (B) is the free-radical polymerization product from monomers selected from glycolide, lactide and p-dioxanone.

Compounds and compositions are provided which are useful in additive printing, particularly additive printing techniques such as stereolithography (SLA) wherein a macromer is photopolymerized to form a manufactured article. Representative compounds comprise a polyaxial central core (CC) and 2-4 arms of the formula (A)-(B) or (B)-(A) extending from the central core, where at least one of the arms comprise a light-reactive functional group (Q) and (A) is the free-radical polymerization product from monomers selected from trimethylene carbonate (T) and -caprolactone (C), while (B) is the free-radical polymerization product from monomers selected from glycolide, lactide and p-dioxanone.

A method for the preparation of block copolymers including at least one high vinyl segment, the method comprising (i) charging into a reactor a diene monomer in a hydrocarbon solvent, a catalytically effective amount of anionic initiator, and an oligomeric oxolanyl propane, whereby the reactor is optionally cooled, to form a first batch; (ii) allowing the monomer to polymerize at a peak polymerization temperature of at least about 18 C. and less than about 60 C. to form a first block where the vinyl content is at least about 50 percent by weight; (iii) charging into the reactor a vinyl aromatic monomer, whereby the reactor is optionally heated to a temperature up to about 60 C., to form a second batch; (iv) allowing the monomer to polymerize the second batch to fully convert all monomer to form a second block; and (v) charging into the reactor a quenching agent.

A method for the preparation of block copolymers including at least one high vinyl segment, the method comprising (i) charging into a reactor a diene monomer in a hydrocarbon solvent, a catalytically effective amount of anionic initiator, and an oligomeric oxolanyl propane, whereby the reactor is optionally cooled; (ii) allowing the diene monomer to polymerize at a peak polymerization temperature of at least about 18 C. and less than about 60 C. to form a first block where the vinyl content is at least about 50 percent by weight; (iii) after step (ii), charging into the reactor a vinyl aromatic monomer, whereby the reactor is optionally heated to a temperature up to about 60 C.; (iv) allowing the vinyl aromatic monomer to polymerize to form a second block; and (v) optionally charging into the reactor a quenching agent.

A method for the preparation of block copolymers including at least one high vinyl segment, the method comprising (i) charging into a reactor a diene monomer in a hydrocarbon solvent, a catalytically effective amount of anionic initiator, and an oligomeric oxolanyl propane, whereby the reactor is optionally cooled; (ii) allowing the diene monomer to polymerize at a peak polymerization temperature of at least about 18 C. and less than about 60 C. to form a first block where the vinyl content is at least about 50 percent by weight; (iii) after step (ii), charging into the reactor a vinyl aromatic monomer, whereby the reactor is optionally heated to a temperature up to about 60 C.; (iv) allowing the vinyl aromatic monomer to polymerize to form a second block; and (v) optionally charging into the reactor a quenching agent.

Provided are novel polymer particles for carrying a physiologically active substance and a method of preparing the same. The polymer particles for carrying a physiologically active substance can provide an analytical reagent, which has high analytical precision and sensitivity and can be stably prepared; can easily and precisely control the amount of functional groups carrying the physiologically active substance; can introduce, onto the surface of latex particles, a hydrophilic compound for inhibiting a nonspecific reaction; and can be prepared to have a narrow and uniform particle size distribution. The polymer particles for carrying a physiologically active substance are obtained by polymerizing a monomer, a radical polymerization initiator, and an emulsifier, and the emulsifier is an amphiphilic block polymer of the general formula (1):

##STR00001##

A polyolefin-polybutadiene block-copolymer and a tire tread composition comprising the polyolefin-polybutadiene block-copolymer, the composition comprising, by weight of the composition, within the range from 15 to 60 wt % of a styrenic copolymer, processing oil, filler, a curative agent, and from 4 to 20 wt % of a polyolefin-polybutadiene block-copolymer, wherein the polyolefin-polybutadiene block-copolymer is a block copolymer having the general formula PO-XL-fPB; where PO is a polyolefin block having a weight average molecular weight within the range from 1000 to 150,000 g/mole, the fPB is a functionalized polar polybutadiene block having a weight average molecular weight within the range from 500 to 30,000 g/mole, and XL is a cross-linking moiety that covalently links the PO and fPB blocks; and wherein the maximum Energy Loss (Tangent Delta) of the immiscible polyolefin domain is a temperature within the range from 30 C. to 10 C.