摘要:
Nitrogen-containing organopolysiloxanes which may also contain crosslinkable reactive groups are easily prepared by reaction of an alkoxy-functional oligosilane containing methylene linkages between silyl groups and nitrogen with organopolysiloxanes condensable therewith. The nitrogen may be quaternized if desired. The chain amino nitrogens can subsequently be quaternized if desired. Uses for the products include single component crosslinkable compositions.
摘要:
The invention relates to moisture-crosslinkable organopolysiloxane-polyurea block copolymers, to a process for preparing the crosslinkable organopolysiloxane-polyurea block copolymers, and to their use; to crosslinkable compositions comprising the crosslinkable organopolysiloxane-polyurea block copolymers, to the preparation of the crosslinkable compositions, to their vulcanization, and to the use of the vulcanizates.
摘要:
Siloxane-urea copolymers are easily prepared by reacting a bis- or poly[azasilacyclopentyl]-terminated compound with a hydroxyl-functional compound followed by reaction with di- or polyisocyanate. When a bis[hydroxyl]-functional compound is used, the resulting polymer may be reacted with additional di- or polyisocyanate, optionally in the presence of additional isocyanate-reactive compounds such as chain extenders.
摘要:
The invention relates to moisture-crosslinkable organopolysiloxane-polyurea block copolymers, to a process for preparing the crosslinkable organopolysiloxane-polyurea block copolymers, and to their use; to crosslinkable compositions comprising the crosslinkable organopolysiloxane-polyurea block copolymers, to the preparation of the crosslinkable compositions, to their vulcanization, and to the use of the vulcanizates.
摘要:
Organopolysiloxaneurea polymers with good melt viscosity but which effectively crosslink in the presence of moisture contain alkylalkoxysilane or alkylaminoalkylalkoxysilane groups pendant to the polymer chain. The polymers are useful as non-creeping hot melt adhesives, and for other uses as well.
摘要:
Organopolysiloxane compositions obtainable by reaction of (a) essentially linear organopolysiloxanes which are terminated at both ends by Si-bonded hydroxy groups, (b) optionally, plasticizers, (c) at least one dialkylaminomethylalkyldialkoxysilane chain extender and/or partial hydrolysate thereof, (d) at least one deactivator, (e) optionally, one or more alkyltrialkoxysilanes and/or partial hydrolysates thereof, and (f) optionally, catalysts for accelerating the reaction of silane (e) with Si—OH groups, are useful in low-modulus compositions which can be crosslinked at room temperature, in particular, compositions which crosslink with elimination of alcohols.
摘要:
The invention relates to organopolysiloxanes containing at least one unit of formula (I) R2SiO2/2, at least one unit of formula (II) (R5O)R2SiO1/2, and at least one unit of formula (III) (R1R2N—CR102—)RSiO2/2, whereby the radicals and indices have the meanings as cited in Claim 1. The invention also relates to the production of these organopolysiloxanes and to their use in substances that can be cross-linked at room temperature, particularly in those that cross-link while alcohols are separated.
摘要:
One component vulcanizable silicone elastomer compositions contain at least one organosilicon compound bearing a plurality of hydrolyzable groups, optionally one or more crosslinkers bearing hydrolyzable groups, and a catalyst system comprising a tin compound bearing a sulphonic acid, sulfonic acid amide, or sulfonic acid ester group, and a basic nitrogen compound. Storage stable compositions capable of vulcanizing to clear or translucent moldings are produced.
摘要:
Storage stability of one-component elastomers prepared from constituents having alkoxysilyl end groups is enhanced by employing bin compounds having a coordination number of 5 or 6 in which tin is coordinately bonded to a P═O group as at least one condensation catalyst.
摘要:
Organopolysiloxaneurea polymers with good melt viscosity but which effectively crosslink in the presence of moisture contain alkylalkoxysilane or alkylaminoalkylalkoxysilane groups pendant to the polymer chain. The polymers are useful as non-creeping hot melt adhesives, and for other uses as well.