A polycarbonate diol containing a repeating unit represented by the specific formula (A) and a terminal hydroxyl group, wherein more than 0 mol % and not more than 3.0 mol % of the terminals thereof is an oxolane terminal represented by the specific formula (B).

The present invention describes a process for producing an elastomer, preferably a polyurethane-containing elastomer, by reacting a polyol component (A) comprising at least one polyether carbonate polyol (A-1) containing carbon-carbon double bonds with a component (B) which is reactive with OH groups and contains at least one compound reactive toward OH groups, preferably an isocyanate component (B-1) containing NCO groups, in the presence of a free-radical initiator (C), preferably at least one peroxide (C-1), and optionally a catalyst (D), where the molar ratio of the OH-reactive groups of component (B) reactive with groups, to the OH groups of the polyol component (A) containing carbon-carbon double bonds, is greater than 1.0. It further relates to elastomers obtainable by such a process, preferably polyurethane elastomers, the use thereof, and two-component systems for production of elastomers, preferably polyurethane elastomers.

The present disclosure relates to a composition that includes a structure as defined by

##STR00001##

where includes a covalent bond, n is between 0 and 20, inclusively, and m is between 0 and 20, inclusively.

A silicone-polycarbonate copolymer has the formula X.sub.g[Z.sub.jY.sub.o].sub.c, where each X is an independently selected silicone moiety having a particular structure, each Y is an independently selected polycarbonate moiety, each Z is an independently selected siloxane moiety, subscript c is from 1 to 150, subscript g is >1, 0≤j<2, and 0<o<2, with the proviso that j+o=2 in each moiety indicated by subscript c. Methods of preparing the silicone-polycarbonate copolymer are also disclosed. Further, a sealant is disclosed, the sealant comprising the silicone-polycarbonate copolymer and a condensation-reaction catalyst.

A silicone-polycarbonate copolymer has the formula X.sub.g[Z.sub.jY.sub.o].sub.c, where each X is an independently selected silicone moiety having a particular structure, each Y is an independently selected polycarbonate moiety, each Z is an independently selected siloxane moiety, subscript c is from 1 to 150, subscript g is >1, 0≤j<2, and 0<o<2, with the proviso that j+o=2 in each moiety indicated by subscript c. Methods of preparing the silicone-polycarbonate copolymer are also disclosed. Further, a sealant is disclosed, the sealant comprising the silicone-polycarbonate copolymer and a condensation-reaction catalyst.

Described herein are methods of preparing poly(alkylene carbonate) polymers comprising an increased ratio of primary hydroxyl end groups to secondary hydroxyl end groups, and compositions thereof.

The present invention relates to a kind of organic metal-free catalysts containing both electrophilic and nucleophilic dual-functions, preparation methods of making the same, and uses thereof. The organic metal-free catalysts in the present invention have the chemical structure shown in formula (I):

##STR00001##

Compared with the metal-free organic polymerization catalytic systems that have been reported before, the organic metal-free catalysts in this invention have the combined advantages of simple preparation, high reactivity, easy operation, low cost, wide applicability, easy for industrial production.

A biodegradable cationic polymer is disclosed, comprising first repeat units derived from a first cyclic carbonyl monomer by ring-opening polymerization, wherein more than 0% of the first repeat units comprise a side chain moiety comprising a quaternary amine group; a subunit derived from a monomeric diol initiator for the ring-opening polymerization; and an optional endcap group. The biodegradable cationic polymers have low cytotoxicity and form complexes with biologically active materials useful in gene therapeutics and drug delivery.

There is a process for preparing polycarbonate. The process has the step of copolymerizing an epoxy compound and carbon dioxide (CO.sub.2) in the presence of a catalytic system having at least one catalyst selected from complexes of a transition metal having general formula (I):

##STR00001##

The aforesaid process allows to obtain polycarbonates having a quantity of carbonate bonds in chain greater than 95% or polycarbonate/polyether copolymers having a quantity of ether bonds in chain ranging from 15% to 90%.

Provided is a synthesis method comprising a first step of producing a carbonate compound from carbon monoxide and an alcohol-based compound at an anode of a first electrochemical cell comprising a cathode and the anode, and a second step of synthesizing a first product by a dealcoholization reaction of the carbonate compound, wherein an alcohol-based compound eliminated in the second step is recycled in the first step.