The present invention relates to a high-melt-strength polypropylene resin, and a preparation method therefor. A method for preparing the high-melt-strength polypropylene resin, according to the present invention, comprises the steps of: creating a polypropylene by polymerizing propylene monomers in the presence of a metallocene catalyst; and putting a diene compound and a comonomer into the created polypropylene and unreacted propylene monomers and reacting same, thereby forming a C40 or greater long-chain branch on the main chain of the polypropylene.

A heterogeneous in-situ polymer blend comprising a continuous phase comprising a polypropylene having a crystallinity of at least 30% and a melting point temperature T.sub.m greater than 130 C., and a heat of fusion H.sub.f greater than 65 J/g; and a dispersed phase comprising particles of an elastomeric copolymer dispersed in the continuous phase and having an average particle size of less than 5 micron, the elastomeric copolymer comprising ethylene units and 0.001 to 5 wt % diene by weight of the copolymer, and having a crystallinity of less than 20% and being at least partially cross-linked such that the degree of cross-link is at least 20%.

A heterogeneous in-situ polymer blend comprising a continuous phase comprising a polypropylene having a crystallinity of at least 30% and a melting point temperature T.sub.m greater than 130 C., and a heat of fusion H.sub.f greater than 65 J/g; and a dispersed phase comprising particles of an elastomeric copolymer dispersed in the continuous phase and having an average particle size of less than 5 micron, the elastomeric copolymer comprising ethylene units and 0.001 to 5 wt % diene by weight of the copolymer, and having a crystallinity of less than 20% and being at least partially cross-linked such that the degree of cross-link is at least 20%.

A process and articles for continuously making a tetrapolymer using two reactors connected in series with two unsaturated hydrocarbon streams, two injections of ethylene monomer, two injections of propylene monomer, and two injections of two different non-conjugated diene monomers with a Ziegler-Natta, a catalyst, a co-catalyst, and an optional promoter. The process allows for the creation of products and articles with high molecular weights while utilizing continuous flow reactors in series. The process allows for manufacture of anti-vibration articles made by tetrapolymers.

A process and articles for continuously making a tetrapolymer using two reactors connected in series with two unsaturated hydrocarbon streams, two injections of ethylene monomer, two injections of propylene monomer, and two injections of two different non-conjugated diene monomers with a Ziegler-Natta, a catalyst, a co-catalyst, and an optional promoter. The process allows for the creation of products and articles with high molecular weights while utilizing continuous flow reactors in series. The process allows for manufacture of anti-vibration articles made by tetrapolymers.

A process and articles for continuously making a tetrapolymer can use two reactors connected in series with two saturated hydrocarbon streams, two injections of ethylene monomer, two injections of propylene monomer, and two injections of two different non-conjugated diene monomers simultaneously. Also, the process has a metallocene catalyst and a metallocene co-catalyst in the first reactor and a Ziegler-Natta catalyst, a Ziegler-Natta co-catalyst, and optionally a promoter in the second reactor. This process allows for the creation of products with high molecular weights while utilizing continuous flow reactors in series. The process allows for manufacture of anti-vibration articles made from the high molecular weight tetrapolymers.

A process and articles for continuously making a tetrapolymer can use two reactors connected in series with two saturated hydrocarbon streams, two injections of ethylene monomer, two injections of propylene monomer, and two injections of two different non-conjugated diene monomers simultaneously. Also, the process has a metallocene catalyst and a metallocene co-catalyst in the first reactor and a Ziegler-Natta catalyst, a Ziegler-Natta co-catalyst, and optionally a promoter in the second reactor. This process allows for the creation of products with high molecular weights while utilizing continuous flow reactors in series. The process allows for manufacture of anti-vibration articles made from the high molecular weight tetrapolymers.

A process and articles for continuously making a tetrapolymer using two reactors connected in series with two saturated hydrocarbon streams, two injections of ethylene monomer, two injections of propylene monomer, and two injections of two different non-conjugated diene monomers simultaneously with two metallocene catalysts and two metallocene co-catalysts. This process allows for the creation of products with high molecular weights while utilizing continuous flow reactors in series, preventing an additional blending step. The process allows for manufacture of anti-vibration articles made by the tetrapolymers.

A process and articles for continuously making a tetrapolymer using two reactors connected in series with two saturated hydrocarbon streams, two injections of ethylene monomer, two injections of propylene monomer, and two injections of two different non-conjugated diene monomers simultaneously with two metallocene catalysts and two metallocene co-catalysts. This process allows for the creation of products with high molecular weights while utilizing continuous flow reactors in series, preventing an additional blending step. The process allows for manufacture of anti-vibration articles made by the tetrapolymers.

A precursor composition comprising, before curing, ethylene propylene diene monomer (EPDM), an aramid, and a carbon material comprising carbon nanotubes, graphite, or a combination thereof. A rocket motor including a reaction product of the precursor composition and a method of insulating a rocket motor are also disclosed.