Abstract: Process for the preparation of fluid organosilicon compounds usable in adhesive, coating and sealant formulations is described. The process includes the synthesis of organosilicon prepolymer compositions starting from unsaturated polyurethanes obtained in turn from unsaturated monoalcohol polyethers and diisocyanates with a controlled NCO/OH ratio, to which chlorosilanes are added in the presence of methyl or ethyl orthoformates.

Abstract: Process for the preparation of fluid organosilicon compounds usable in adhesive, coating and sealant formulations is described.

Abstract: The invention describes a process for the preparation of polycarbonate copolyester diols with a molecular weight ranging between 1000 and 6000 units having the following general formula: ##STR1## wherein the polycarbonate or polyether polycarbonate diol units ##STR2## represent a proportion of between 30 and 70% by weight of the whole polycarbonate or polyether carbonate co-polyester diolR.sub.1 is a divalent organic radical deriving from one or more polyetherglycols or aliphatic glycols containing from 4 to 20 carbon atoms;R.sub.2 is a divalent organic radical corresponding to a cyclic lactone having a ring with 4, 6, 7 atoms or an organic residue deriving from a lactide or glycolide;n and m, the same or different, can have any value between 2 and 40;said process being characterized in that cyclic esters having the formula: ##STR3## wherein R.sub.2 has the meaning defined above, are reacted with polycarbonate or polyethercarbonate diols having the formula: ##STR4## wherein R.sub.

Abstract: A process is described for the preparation of polycarbonate polyether polyols characterized in that dimethylcarbonate (DMC) and one or more polyether diols are reacted at a ratio DMC/polyether diols of between 0.5 and 1.35, at a temperature of between 130.degree. and 175.degree. C. and in the presence of a catalyst consisting of an oxide, a carbonate or an alcoholate of a metal of the first or second group or a salt or organometallic compound of a metal belonging to the third or fourth or fifth group at a concentration of between 0.0001 and 0.01%.

Abstract: A process for the preparation of polycarbonate copolyether diols comprising two successive reaction stages wherein in the first stage the precursor, bisdimethylcarbonate of polyether diols is synthesized by reacting, in a reactor equipped with a distillation column, one or more polyetherglycols with dimethyl carbonate, in the presence of a basic catalyst selected from the group consisting of an oxide, a hydroxide, a carbonate and an alcoholate of a metal belonging to the group of alkaline or earth-alkaline metals and in the second stage, the precursor, after being freed from the catalyst and excess dimethylcarbonate, is converted to polycarbonate copolyether diols by transesterification reaction with polyetherglycols in the presence of a solvent and an organometallic catalyst selected from compounds of tin, lead, titanium, zirconium and antimonium, said polycarbonate polyether diols having utility as additives in the field of polyurethane end-products, thermoelastomers, paints and adhesives.

Abstract: Diol-polycarbonates having the general formulaHO--(Ri--O--CO--O).sub.x ----(R.sub.2 --O--CO--O--).sub.y --R.sub.3 --OH (I)where R.sub.1, R.sub.2, R.sub.3, X and Y have the meaning specified in the text, are used in the synthesis of prepolymers which in turn can be used in reactive adhesive and/or sealing formulations of the hygro-, photo- or thermosetting type, and the procedure for their preparation. The sealing compositions deriving from these diolterminated-polycarbonates are mainly used in transport industry, in the textile and wood industry, for cellular products and in the bookbinding industry.

Abstract: New silanes containing at least two oxazolidinic moieties can be defined by means of the general formula: ##STR1## wherein X.sub.1, X.sub.2, X.sub.3 and X.sub.4 have the meaning as reported in the specification, and each one of A.sub.1, A.sub.2 and A.sub.3 represents from 0 to a plurality of siloxane radicals--SiO--and are better defined in the text of the specification.These compounds are useful as crosslinking agents for moisture-hardening systems based on polyisocyanates, of acrylate polymers and of polyepoxides in compositions for coatings, sealants and adhesive agents.

Abstract: New procedure for the preparation of polyoxazolidines which can be defined with the general formula: ##STR1## This procedure, which excludes the use of isocyanates, requires the simple transesterification of the dicarbamate of a diamine with an N-hydroxyalkyloxazolidine.

Abstract: New polyoxazolidines can be defined with the general formula: ##STR1## where R, R.sub.1, R.sub.2 and n have the meaning specified in the description. These polyoxazolidines are useful cross-linking agents for hydrocuring systems based on polyisocyanates, acrylate polymers and polyepoxides, in compositions for paints, coatings, sealants and adhesives.

Abstract: Copolyester-diol polycarbonates fluid at room temperature, having a number average molecular weight comprised within the range of from 1,500 to 6,000 with a glass transition temperature (T.sub.g) lower than -45.degree. C., useful in the sector of polyurethanes and in the sector of sealants, are obtained by means of a reaction of transesterification by starting from:(a) and organic carbonate,(b) an aliphatic diol,(c) an oligopolyester-diol.This latter is the product of reaction of an aliphatic bicarboxy acid with a mixture of two or more diols, comprising neopentyl glycol.

Abstract: New silanes containing at least two oxazolidinic moieties can be defined by means of the general formula: ##STR1## wherein X.sub.1, X.sub.2, X.sub.3 and X.sub.4 have the meaning as reported in the specification, and each one of A.sub.1, A.sub.2 and A.sub.3 represents from 0 to a plurality of siloxane radicals--SiO--and are better defined in the text of the specification.These compounds are useful as crosslinking agents for moisture-hardening systems based on polyisocyanates, of acrylate polymers and of polyepoxides in compositions for coatings, sealants and adhesive agents.

Abstract: New polyoxazolidines can be defined by means of the general formula: ##STR1## wherein R, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and n have the meaning as reported in the specification. These polyoxazolidines are useful as crosslinking agents for moisture-hardening systems on the basis of polyisocyanates, acrylate polymers and polyepoxides, in compositions for coatings, sealant compositions and adhesive compositions.

Abstract: Novel silicon-organic compounds containing an oxazolidine group are defined by the general formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, X, n and y have the meanings reported in the description. These compounds are capable of co-cross-linking and to act as adhesion promoters on various polar substrates, in compositions based on poly-isocyanates, polyepoxides or polacrylates, in the field of sealants and adhesives.

Abstract: A reactive hot melt composition comprises the products of the reaction between (A) an aliphatic or aromatic diisocyanate and (B) a mixture containing: (1) a crystalline polycarbonate diol, (2) an elastomeric polycarbonate diol or an elastomeric polycarbonate copolyester diol, and possibly (3) a vitreous polycarbonate diol or a vitreous polycarbonate copolyester diol. The process for preparing the reactive hot melt composition is also described .

Abstract: Polyol-polycarbonates having a molecular weight comprising within the range from 750 to 2500, endowed with good rheologic characteristics and having a low glass transition temperature (Tg), are obtained by means of the reaction, under transesterification conditions, of(a) an organic carbonate;(b) a saturated alifatic .alpha.,.omega.-glycol; and(c) tris-(hydroxyethyl)-isocyanurate.These polyol-polycarbonates are useful as bases for paints in combination with polyisocyanates.Furthermore, the polyol-polycarbonates can be reacted with bicarboxy acids, or with cyclic anhydrides in order to yield the corresponding products with carboxy end groups which are useful as bases for paints in combination with melaminic or epoxy resins.

Abstract: Reactive stabilizing compounds, able to stabilize organic polymers, contain in their molecule a sterically hindered amino group and a hydrolyzable silyl function. In stabilizing organic polymers, said reactive stabilizing compounds can be hydrolyzed at the silyl function with the formation of silanol groups, which are made to interact in order to form complex resinous stabilizing structures. These latter are added in stabilizing quantities to the polymer to be stabilized. According to one particular embodiment, the hydrolysis at the silyl function and the formation of the resinous structure take place spontaneously within the polymer to be stabilized. According to a further embodiment, the reactive stabilizing compound is added to the polymer after being stably supported on a solid support by reaction with an inorganic solid having surface hydroxyl groups.

Abstract: Reactive stabilizing compounds, able to stabilize organic polymers, contain in their molecule a sterically hindered amino group and a hydrolyzable silyl function.In stabilizing organic polymers, said reactive stabilizing compounds can be hydrolyzed at the silyl function with the formation of silanol groups, which are made to interact in order to form complex resinous stabilizing structures. These latter are added in stabilizing quantities to the polymer to the stabilized.According to one particular embodiment, the hydrolysis at the silyl function and the formation of the resinous structure take place spontaneously within the polymer to be stabilized.According to a further embodiment, the reactive stabilizing compound is added to the polymer after being stably supported on a solid support by reaction with an inorganic solid having surface hydroxyl groups.

Abstract: Stabilizers for organic polymers are disclosed, of the type of sterically hindered phenols or amines, which are obtained by means of the reaction of a sterically hindered phenol or amine bearing in the molecule at least in alkoxysilanol group with a mono- or poly-hydroxy aliphatic alcohol, by a transesterification reaction.The stabilizers so obtained are compatible with the organic polymers, wherein they remain stably.

Abstract: A thermosetting liquid moulding composition comprising:(a) a polyepoxide containing at least two epoxide groups per molecule;(b) a tricarboxylic acid definable by the general formula: ##STR1## where: R.sup.1, R.sup.2 and R.sup.3 have the meaning given in the description; and(c) a diacarboxylic acid anhydride.This composition can be transformed by liquid moulding into manufactured articles particularly useful in the electrical sector.

Abstract: Reactive antioxidant compounds, able to stabilize organic polymers, contain in their molecule a sterically hindered phenolic group and a hydrolysable silyl function. In stabilizing organic polymers, said reactive antioxidant compounds can be hydrolysed at the silyl function with the formation of silanol groups, which are made to interact in order to form complex resinous stabilizing structures. These latter are added in stabilizing quantities to the polymer to be stabilized. According to one particular embodiment, the hydrolysis at the silyl function and the formation of the resinous structure take place spontaneously within the polymer to be stabilized. According to a further embodiment, the reactive antioxidant compound is added to the polymer after being stably supported on a solid support by reaction with an inorganic solid having surface hydroxyl groups.