A modified conjugated diene-based polymer, and more particularly, a modified conjugated diene-based polymer prepared by continuous polymerization and having remarkable processability, narrow molecular weight distribution and excellent physical properties, and a rubber composition including the same.

This invention relates to improved adhesion compositions and textile materials and articles treated therewith. The improved adhesion composition comprises a non-crosslinked resorcinol-formaldehyde and/or resorcinol-furfural condensate (or a phenol-formaldehyde condensate that is soluble in water), a rubber latex, and an aldehyde component such as 2-furfuraldehyde. The composition may be applied to textile substrates and used for improving the adhesion between the treated textile substrates and rubber materials. End-use articles that contain the treated textile-rubber composite include, without limitation, automobile tires, belts, and hoses as well as printing blankets.

A rubber composition comprises at least one resin based on: (A1) at least one aromatic compound resulting from the reaction between a reactant of formula (α): ##STR00001##
where B represents CHO or CH.sub.2OH, (α) and a reactant of formula (β) or ##STR00002##
and (A2) at least one phenolic compound chosen from: (A21) at least one aromatic polyphenol comprising at least one aromatic ring bearing at least two hydroxyl functional groups in the meta position with respect to one another, the two positions ortho to at least one of the hydroxyl functional groups being unsubstituted; and/or (A22) at least one aromatic monophenol comprising at least one six-membered aromatic ring bearing a single hydroxyl functional group, the two positions ortho to the hydroxyl functional group being unsubstituted or at least one position ortho to and the position para to the hydroxyl functional group being unsubstituted.

The present disclosure is directed to textile cords covered with a rubber composition of specified composition, tires having at least one component comprising the rubber-covered textile cords, and related methods for increasing aged cord coverage of rubber-covered textile cords and for preparing the rubber-covered textile cords. The rubber composition of specified composition includes silica filler in an amount of up to 20 phr and silane coupling agent in an amount of up to 5 phr.

Provided are a rubber composition for tires that provides improved silica dispersion and fuel economy while maintaining good hardness, and a pneumatic tire including the rubber composition. The present invention relates to a rubber composition for tires, containing a rubber component, silica, and a silica dispersing agent represented by the following formula (I).

##STR00001##

A catalyst composition of the present disclosure comprises: a rare earth element-containing compound (A) containing a rare earth element compound or a reaction product thereof with a Lewis base, an organic metal compound (B) of a formula: YR.sup.1.sub.aR.sup.2.sub.bR.sub.c.sup.3 [wherein Y is a metal selected from Group 1, Group 2, Group 12, and Group 13 of the periodic table, le and R.sup.2 are each a hydrocarbon groups having 1 to 10 carbon atoms or a hydrogen atom, R.sup.3 is a hydrocarbon group having 1 to 10 carbon atoms, a is 1 and b and c are 0 when Y is a metal in Group 1, a and b are 1 and c is 0 when Y is a metal in Groups 2 and 12, and a, b, and c are all 1 when Y is a metal in Group 13], and a compound having a polar functional group (C).

The present invention is directed to a non-vulcanized rubber composition which is comprised of (1) 90 phr to 100 phr cis 1,4-polyisoprene; (2) 10 phr to 40 phr of pre-silanized precipitated silica; (3) 10 phr to 40 phr of carbon black, (4) 0.1 phr to 5 phr of a cobalt salt, and (5) 1 phr to 15 phr of a resinous reaction product of a methylene donor composition and a methylene acceptor composition. Moreover, the present invention is directed to a tire or tire component comprising the cured rubber composition.

Problem to be Solved

The present invention provides a conjugated diene-based polymer composition excellent in rolling resistance, grip performance on a wet road surface, and abrasion resistance when formed into a tire.

Solution

A conjugated diene-based polymer composition containing: 10 to 90 parts by mass of a conjugated diene-based polymer (A) having a glass transition temperature of −20° C. or more; and 10 to 90 parts by mass of a conjugated diene-based polymer (B) having a glass transition temperature of −25° C. or less, wherein the conjugated diene-based polymer (A) has an absolute molecular weight, measured by viscosity detector-equipped GPC-light scattering measurement, of 40×10.sup.4 or more and 5000×10.sup.4 or less, and a branch number (Bn), measured by the viscosity detector-equipped GPC-light scattering measurement, of 8 or more.

The present application provides a rubber composition as a raw material of a rubber for coating steel cords, which shows an effect of a durability improvement. The present application also provides a pneumatic tire including the rubber for coating steel cords superior in the durability. The objectives above can be solved by providing a rubber composition, including: a rubber component a filler, a vulcanization agent, a vulcanization accelerator, a resorcinol resin, and a heat-resistant crosslinking agent, wherein the rubber composition includes a cobalt salt at a content of 0.1 part by mass or less with respect to 100 parts by mass of the rubber component, as well as by providing a pneumatic tire including a rubber for coating steel cords which has been obtained by vulcanizing the rubber composition.

The present invention provides a rubber composition having reduced its odor, which can show a durability improvement effect, as well as to provide a pneumatic tire including the rubber for coating steel cords which is superior in its durability. The objectives above can be solved by providing a rubber composition, including a rubber component a filler, a vulcanization agent, a vulcanization accelerator, and a resorcinol resin, in which the resorcinol resin includes a cresol residue at a content of 0.2 mass % or less, as well as providing a pneumatic tire which has been obtained by vulcanizing the rubber composition, and in particular providing a pneumatic tire in which the rubber is a rubber for coating steel cords.