A double coating, curing method, cured coating, and kit are provided. A first layer of the double coating can be a first cure coating composition, which has a first hydroxy-functional resin, a first crosslinking agent, and a first catalyst. A second layer of a second cure coating composition can have a low hydrophilicity acrylic resin as a second hydroxy-functional resin, a second crosslinking agent, and a second catalyst. The first catalyst catalyzes crosslinking between the second hydroxy-functional resin and crosslinking agent, and not between the first hydroxy-functional resin and crosslinking agent. The second catalyst catalyzes crosslinking between the first hydroxy-functional resin and crosslinking agent, and not between the second hydroxy-functional resin and crosslinking agent. The first and/or second hydroxy functional resins can facilitate catalyst migration from one layer to the other. The separate compositions can be shelf-stable and/or the curing can occur at low temperature.

A use of a polymerizable ultraviolet absorber is disclosed, which is applied to a polyurethane preparation. The polymerizable ultraviolet absorber is obtained by reacting an UV absorber having a reactive hydrogen group with a polyisocyanate having three NCO groups. In addition, a composition for forming polyurethane comprising the aforementioned polymerizable ultraviolet absorber is also disclosed.

Polyurethane polymers are described comprising polymerized units comprising a hydroxy functional aromatic group wherein the hydroxy group has been functionalized with an adhesion promoting group. In some embodiments, the polyurethane polymer comprises polymerized units have the general structure wherein L.sub.1 and L.sub.2 are independently divalent linking groups comprising an urethane group; and R.sub.A is an adhesion promoting group bonded to the oxygen atom by means of an ionic or covalent bond. In other embodiments, film articles, laminates are described and methods of making functionalized polyurethane polymers are described.

##STR00001##

A composite material that is a copolymer of at least (i) a functionalised carbon nanoparticle, (ii) a polyol, (iii) a compound comprising at least two isocyanate groups, wherein the functionalised carbon nanoparticle and the polyol are covalently bonded by a urethane and optionally a urea and/or an amide linkage, and a process for producing the same. The composite materials are suitable for use in moulded articles for implantation within a mammal.

The invention relates to a functionalized polymer to which at least one Diels-Alder adduct is covalently bonded, said Diels-Alder adduct containing a furan and a maleimide component and the furan or the maleimide component having a functional organyl group the molar mass of which is less than 800 g/mol.

Disclosed herein is a dry, self-supporting fibrous material, the fibers of which have been treated with a binder composition. The fibrous material can be slit into tapes or tows that are suitable for use in an Automated Tape Laying (ATL) or Automated Fiber Placement (AFP) process. This fibrous material is suitable for forming preforms which are configured to receive a matrix resin by resin infusion in the manufacturing of structural composite parts.

Polyurea Copolymer Presently claimed invention is directed to a process for treating polyurethane, polyurea and/or polyurethane-polyurea copolymers comprising the steps of: a) providing at least one component (A) selected from the group consisting of polyurethane, polyurea and polyurethane-polyurea copolymers; and b) providing at least one secondary amine of formula (B); c) reacting the at least one component (A) with the at least one secondary amine of formula (B) to obtain a first reaction product (D); d) proving at least one isocyanate component (C); e) reacting the first reaction product (D) obtained in step c. with the at least one isocyanate component (C) to obtain a product, wherein the at least one isocyanate component (C) has an average NCO functionality of ?2.0.

A polycarbodiimide composition is a reaction product of polyisocyanate having a primary isocyanate group and alcohols, wherein in an infrared absorption spectrum, the intensity ratio (IR.sub.CI/IR.sub.UI+U) of absorbance IR.sub.CI at or near 2120 cm.sup.1 due to stretching vibration of the carbodiimide group relative to absorbance IR.sub.UI+U at or near 1720 cm.sup.1 due to stretching vibration of the uretonimine group and urethane group is 1.5 or more and 4.5 or less.

The disclosure provides reversible polymers from polyurea by modifying the nitrogen atom with hindered substituents. The reversibility of hindered urea bond (HUB) can be controlled by changing the bulkiness of the substituents, and N-tert-butyl-N-ethylurea (TBEU), with its high binding constant and short lifetime, is applicable in the design of reversible polymer and self-healing materials at mild temperatures without external stimuli. HUB can be used in the design of smart materials with its adjustable reversibility, facile synthesis, and compatibility with many other polymer structures.

A polycarbodiimide composition is a reaction product of polyisocyanate having a primary isocyanate group and alcohols, wherein in an infrared absorption spectrum, the intensity ratio (IR.sub.CI/IR.sub.UI+U) of absorbance IR.sub.CI at or near 2120 cm.sup.1 due to stretching vibration of the carbodiimide group relative to absorbance IR.sub.UI+U at or near 1720 cm.sup.1 due to stretching vibration of the uretonimine group and urethane group is 1.5 or more and 4.5 or less.