The present disclosure provides for a polyolefin-based composition made from or comprising (A) a first polymer composition made from or containing an ethylene polymer grafted with an unsaturated monomer, and (B) a second polymer composition comprising a propylene polymer, wherein the ethylene polymer grafted with an unsaturated monomer is covalently bonded to the propylene polymer. The polymeric composition may be used as a tie-layer adhesive composition.

The invention relates to a process for assembling and repositioning at least two parts by means of a repositionable hot melt adhesive, wherein said parts are held together in assembled position when said adhesive is at a temperature T.sub.A and can be repositioned in relation to one another when said adhesive is heated to a temperature T.sub.C, wherein said adhesive comprises at least a formulation, which: at the temperature T.sub.C has the form of a mixture of polymer chains comprising at least pendant diene units X and of coupling molecules comprising at least two dienophile end groups Y, wherein said X units and said Y groups are arranged to be able to react with one another and to bond together by means of the Diels-Alder reaction at a temperature T.sub.DA and to be able to regenerate by means of the retro-Diels-Alder reaction at a temperature T.sub.RDA, at a temperature T.sub.A has the form of a three-dimensional network, in which the polymer chains are linked to one another by the coupling molecules by means of the Diels-Alder reaction, where T.sub.A<T.sub.RDAT.sub.C, where T.sub.DA ranges between 0 C. and 100 C. and T.sub.RDA ranges between 50 C. and 200 C., and T.sub.DA is strictly lower than T.sub.RDA.

The polymer chain is a block copolymer comprising at least a first polymer block having a glass transition temperature Tg or a melting temperature Tf ranging between 40 C. and 200 C., and at least a second polymer block comprising at least pendant diene units X and having a glass transition temperature Tg or a melting temperature Tf lower than T.sub.DA.

The present invention relates generally to polyelectrolyte-layer forming block copolymers adsorbed at colloid interfaces in aqua solution and compositions and uses thereof. In particular, the present invention relates to agricultural material compositions comprising particles of at least one agricultural material and a polyelectrolyte-layer forming block copolymer. The present invention also relates to non-agricultural material compositions comprising particles of at least one non-agricultural material and a polyelectrolyte-layer forming block co-polymer.

Provided is a water-absorbing resin capable of having a high swollen gel elastic modulus while maintaining a high swelling capacity and a method for producing the same.

The problem described above is solved by a water-absorbing resin including a water soluble unsaturated monomer having a dissociable group as a main component of a repeating unit of a main chain, wherein the water-absorbing resin has an internal crosslinked structure, a crosslinked structure index expressed by the following numerical formula 1 is 14 or more, a weight average molecular weight (Mw) of the water-absorbing resin after a hydrolysis treatment is 220,000 or less, and a molecular weight distribution (Mw/Mn) of the water-absorbing resin after a hydrolysis treatment is 3.40 or less:

Crosslinked structure index=(Equilibrium swelling capacity with respect to 0.9 wt % physiological saline solution).sup.1/3/(Weight average molecular weight (Mw) after hydrolysis treatment)1000000[Numerical formula 1]

where the hydrolysis treatment is a treatment to leave 50 mg of the water-absorbing resin as a solids content to stand still in 10 g of a 0.1 mol/l aqueous sodium hydroxide solution for 3 weeks at 80 C., and the weight average molecular weight (Mw) is a value measured after the treatment.

In addition, the water-absorbing resin is produced, for example, by a production method including a reaction step for reacting a first star-shaped polymer containing the water soluble unsaturated monomer as a main component of a repeating unit of each branched chain and having a first reactive functional group at a terminal of each branched chain with a second star-shaped polymer containing the water soluble unsaturated monomer as a main component of a repeating unit of each branched chain and having a second reactive functional group capable of forming a chemical bond with the first reactive functional group by reacting with each other at a terminal of each branched chain.

In an example, a thermal interface material includes a polymeric phase-change material.

This invention relates to a process for forming a long-chain branched polymer and a long-chain branched polymer resulting from the process. The process comprises reacting (a) a polyolefin base polymer with (b) a coupling agent comprising a polymeric coupling agent, optionally blended with a molecular coupling agent, the polymeric coupling agent being a modified polyolefin having a reactive coupling group at one or more terminal ends of the modified polyolefin chain, to couple the polyolefin base polymer (a) with the coupling agent (b) to form a long-chain branched polymer having a long-chain branching and/or higher surface energy relative to the polyolefin base polymer.

Provided are multifunctional polymers comprising at least one anhydride repeating unit with at least one pseudo-cationic moiety graft and at least one hydrophobic graft. The grafting functionalizations can occur before, during, or after polymerizing the monomer(s). The anhydride employed may be partially or fully opened to provide amic acids, carboxylic acids, carboxylic acidic salts, imides, esters, and mixtures thereof. The polymers also may comprise other repeating units, including, but not limited to, alpha-olefins. In one embodiment the polymers exhibit antimicrobial activity, and can be employed in a wide variety of compositions, including those where antimicrobial activity is useful. A method of providing microbial activity also is provided.

Provided is a graft copolymer having excellent flexibility, adhesiveness and fatigue resistance while having a high gas barrier property. In the disclosure, a synthetic rubber is introduced, as a graft chain, to a main chain of one or more types of resins selected from a group consisting of polyacrylic acid, polyamide resin, cellulosic resin, polyvinylalcohol resin, ethylene polyvinylalcohol resin, acrylate resin and urethane resin, via a terminal portion of the synthetic rubber.

Concentrates containing specific functionalised diblock copolymers serve as effective additives for improving the cold flow behaviour of fuels and oils, the copolymers being derived from a terminally-unsaturated intermediate polymer obtained via a metallocene process involving hydrogen.

A multilayer film including an odor barrier layer having sound dampening properties is provided. The odor barrier layer is formed from a polyamide modified with a functionalized vinyl-bond rich triblock copolymer.