Poly (tetramethyl-p-silphenylenesiloxane) (PTMPS) membranes and porous articles made therefrom that have a matrix tensile strength in at least one direction from about 1 MPa to about 50 MPa, a matrix modulus greater than about 100 MPa in at least one direction, a porosity greater than about 30%, and a microstructure of nodes interconnected by fibrils are provided. The PTMPS polymer forming the PTMPS membranes and porous articles has a crystallinity of at least about 70%, a polydispersity from 1 to 5, and a weight average molecular weight from about 350 kDa to about 5 MDa. The PTMPS membranes may be asymmetric, meaning that the observed pore structure on one side of the PTMPS membrane is different than the pore structure on the opposing side of the PTMPS membrane. Methods of forming porous PTMPS articles are provided. Dense PTMPS articles and methods of making the same are also provided.

The invention relates to high-temperature-resistant foams having excellent flame retardancy, to the production thereof from organic polyisocyanates and polyepoxides, and to the use of said foams.

The invention relates to temperature-resistant foams with a high degree of flame resistance, to the production of same from aromatic isocyanates and polyepoxides using incorporable catalysts and with formic acid as a blowing agent, and to the use of said foams.

Poly(tetramethyl-p-silphenylenesiloxane) (PTMPS) membranes and porous articles made therefrom that have a matrix tensile strength in at least one direction from about 1 MPa to about 50 MPa, a matrix modulus greater than about 100 MPa in at least one direction, a porosity greater than about 30%, and a microstructure of nodes interconnected by fibrils are provided. The PTMPS polymer forming the PTMPS membranes and porous articles has a crystallinity of at least about 70%, a polydispersity from 1 to 5, and a weight average molecular weight from about 350 kDa to about 5 MDa. The PTMPS membranes may be asymmetric, meaning that the observed pore structure on one side of the PTMPS membrane is different than the pore structure on the opposing side of the PTMPS membrane. Methods of forming porous PTMPS articles are provided. Dense PTMPS articles and methods of making the same are also provided.

Crosslinked silicone foams can be prepared from first and second poly(organosiloxane)s using electron beam radiation. The first poly(organosiloxane) has SiH groups and the second poly(organosiloxane) has SiOH groups. Adhesive articles including pressure-sensitive adhesive crosslinked silicone foams are also disclosed.

In various embodiments a urethane/molecular rebar formulation comprising a specific composition is disclosed. The composition comprises a urethane polymer or prepolymer/discrete carbon nanotube formulation. Utility of the urethane/molecular rebar composition includes improved foams and adhesives.

A tetrafluoroethylene (TFE) copolymer film having a first endotherm between about 50 C. and about 300 C., a second endotherm between about 320 C. and about 350 C., and a third endotherm between about 350 C. and about 400 C. is provided. In exemplary embodiments, the third endotherm is approximately 380 C. In some embodiments, the second endotherm is between about 320 C. and about 330 C. or between about 330 C. and about 350 C. TFE copolymer films have a methane permeability less than about 20 g*micron/cm.sup.2/min. In addition, the dense articles have a void volume of less than about 20%. Methods for dense articles from core shell tetrafluoroethylene copolymers are also provided. The dense articles exhibit improved physical and mechanical properties such as adhesion and barrier properties.

The disclosed latex system comprises a one-component, closed-cell, semi-foam, mastic sealant using gas-filled, flexible, organic microspheres to create a product that is elastic and compressible under pressure without protruding in an outward direction when compressed, thereby allowing the applied sealant to compress in an enclosed, maximum-filled channel unlike typical mastic sealants (while retaining the ability to rebound). This allows the sealant to function as a gasket, and, once fully cured, to have properties including vibration damping, insulating, and condensation resistance. The sealant can be formulated as an air barrier or a vapor barrier and at various degrees of moisture resistance. It may be applied by different packaging variations including aerosol can (bag in can or bag on valve), airless sprayer, cartridge tubes, foil tubes, squeeze tubes, and buckets to be applied using a brush, trowel, spatula, etc. The disclosed mastic sealant can also be formulated to be smoke-resistant and flame-resistant.

Disclosed is method of preparing microspheres wherein the microspheres do not increase the self-extinguishing time of a composition they are added to by more than 5% and their presence does not increase a viscosity of the composition by more than 65%. The microspheres are coated with a very high level of from 80 to 90% by weight of a flame retardant, preferably aluminum trihydroxide. Unexpectedly, the presence of the flame retardant on the microspheres at this high level reduces the need to add additional flame retardant to a composition along with the microspheres. Also unexpectedly, the location of the flame retardant on the microspheres completely prevents the normally expected increase in viscosity of the composition based on the level of the flame retardant added. The microspheres find use in many compositions requiring flame resistance including weld through sealants and adhesives.

A mounting foam contains polyols, isocyanates, plasticizers, surfactants, a catalyst and gases. The foam contains polyols from 30% to 35% and gases from 15.5% to 17.5%, where the ratio of NCO:OH is from 3.4 to 3.9. The foam is used as an adhesive for coatings and to fill voids in structures.