The present invention relates to a thermoplastic resin composition containing a base polymer containing a propylene-based polymer (A) in which a melting endotherm (?H-D) is 0 J/g or more and 60 J/g or less, and a melting point (Tm-D) is not observed or is 0? C. or higher and 120? C. or lower; and a propylene-based polymer (C) in which a melting endotherm (?H-D) is 20 J/g or more and 120 J/g or less, and a melting point (Tm-D) is higher than 120? C., the content of the propylene-based polymer (C) being 0.5 parts by mass or more and 100 parts by mass or less relative to 100 parts by mass of the content of the propylene-based polymer (A).

A branched olefin polymer, a preparation method therefor and the use thereof are provided. The branched olefin polymer is obtained by polymerizing at least one C4-C20 nonterminal olefin monomer with optional ethylene, propylene, and C4-C20 terminal olefin monomers; and the branched olefin polymer has the following characteristics: (a) a molecular weight of 20000 to 500000 g/mol; (b) a molecular weight distribution of 3.5 to 6.0, and a bimodal structure characterized by GPC; (c) a melting point of 0? C. to 110? C. and a glass-transition temperature of ?80? C. to ?50? C.; and (d) having 20 to 200 methyl groups per 1000 methylene groups.

A polyolefin-based hot melt adhesive composition made from or containing (A) 25-75 wt. % of a copolymer of butene-1 with a Melt Flow Rate, measured according to ISO 1133 (190? C., 2.16 kg), higher than 1500; and (B) 75-25 wt. % of at least one additional component selected from the group consisting of waxes, resins, plasticizers, additional polymers and mixtures thereof, wherein the amounts of A) and B) are referred to the total weight of A)+B).

The disclosure provides a bridging agent, a composition, a masterbatch, an encapsulating glue film and an electronic component. The bridging agent has a cyclic structure with the following general structural formula: R.sup.1.sub.xR.sup.2.sub.y[CH.sub.3SiO].sub.n, wherein n is an even number and 4?n?10; R.sup.1 and R.sup.2 are both connected to Si atoms, and x+y is equal to the n; R.sup.1s are in pairwise alignment. R.sup.2s are in pairwise alignment, the R.sup.1s in pairwise alignment are the same, the R.sup.2s in pairwise alignment are the same, the R.sup.1s that are not in alignment are either the same or different, and the R.sup.2s that are not in alignment are either the same or different. The bridging agent of the present disclosure reduces the probability of migration in a polyolefin resin, thereby the creep resistance of the polyolefin resin is improved, and the service life of the electronic component is prolonged.

The disclosure provides a bridging agent, a composition, a masterbatch, an encapsulating glue film and an electronic component. The bridging agent has a cyclic structure with the following general structural formula: R.sup.1.sub.xR.sup.2.sub.y[CH.sub.3SiO].sub.n, wherein n is an even number and 4?n?10; R.sup.1 and R.sup.2 are both connected to Si atoms, and x+y is equal to the n; R.sup.1s are in pairwise alignment. R.sup.2s are in pairwise alignment, the R.sup.1s in pairwise alignment are the same, the R.sup.2s in pairwise alignment are the same, the R.sup.1s that are not in alignment are either the same or different, and the R.sup.2s that are not in alignment are either the same or different. The bridging agent of the present disclosure reduces the probability of migration in a polyolefin resin, thereby the creep resistance of the polyolefin resin is improved, and the service life of the electronic component is prolonged.

A process for increasing MFR.sub.2 of a polyethylene copolymer or an ethylene plastomer or elastomer comprising: (I) extruding a copolymer of polyethylene copolymer having a density of 910 to 970 kg/m.sup.3 and an MFR.sub.2 of 1 and 100 g/10 min or an ethylene plastomer or elastomer having a density of 855 to 910 kg/m.sup.3 and an MFR.sub.2 of 0.5 and 100 g/10 min in the presence of 0.1 to 2 wt % of a non-peroxide radical initiator so as to produce a polyethylene copolymer having an MFR.sub.2 of 200 g/10 min or more, or an ethylene plastomer or elastomer having a MFR.sub.2 of 200 g/10 min or more.

Tie-layer adhesives having graft compositions for bonding to metal substrates is disclosed. The graft compositions are made up of the reaction product of a live, grafted polyolefin and an olefin elastomer. The grafted polyolefin is first made by heating a polyolefin and an unsaturated monomer. Further reaction of the live, grafted polyolefin with an olefin elastomer provides the graft composition. Grafting efficiency is boosted dramatically by the presence of the olefin elastomer and use of the additional reaction step. The graft composition, when formulated into a tie-layer adhesive provides improved bonding to metal substrates.

Tie-layer adhesives having graft compositions for bonding to metal substrates is disclosed. The graft compositions are made up of the reaction product of a live, grafted polyolefin and an olefin elastomer. The grafted polyolefin is first made by heating a polyolefin and an unsaturated monomer. Further reaction of the live, grafted polyolefin with an olefin elastomer provides the graft composition. Grafting efficiency is boosted dramatically by the presence of the olefin elastomer and use of the additional reaction step. The graft composition, when formulated into a tie-layer adhesive provides improved bonding to metal substrates.

The present disclosure provides a polyolefin-based composition, suitable for use as a tie-layer adhesive composition, and a process for making the polyolefin-based composition. The polyolefin-based composition is made from and/or contains a grafted polyolefin copolymer composition, a base resin composition, and optionally, an additives composition. The grafted polyolefin copolymer composition is made from and/or contains a grafted polyolefin composition, an olefin elastomer composition, and a long-chain branched polyolefin composition. The grafted polyolefin is coupled to the olefin elastomer and the long-chain branched polyolefin.

The present disclosure provides a polyolefin-based composition, suitable for use as a tie-layer adhesive composition, and a process for making the polyolefin-based composition. The polyolefin-based composition is made from and/or contains a grafted polyolefin copolymer composition, a base resin composition, and optionally, an additives composition. The grafted polyolefin copolymer composition is made from and/or contains a grafted polyolefin composition, an olefin elastomer composition, and a long-chain branched polyolefin composition. The grafted polyolefin is coupled to the olefin elastomer and the long-chain branched polyolefin.