Self-crosslinking polyurethane, polyurethane polyurea or polyurea dispersions for sizing agents
AssigneeBayer Aktiengesellschaft
InventorsHarald Blum, Karin Naujoks, Eberhard König
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Abstract
The invention relates to self-crosslinking polyurethane, polyurethane-polyurea or polyurea dispersions, a process for the preparation of such dispersions and the use thereof.
Claims20
A self-crosslinking dispersion prepared from one of a polyurethane, a polyurethane-polyurea and a polyurea comprising the dispersed or dissolved reaction product of
- a) at least one polyol component,
- b) at least one di-, tri- and/or polyisocyanate component,
- c) at least one hydrophilic, nonionic or (potentially) ionic structural component selected from the group consisting of compounds with at least one group which is reactive towards isocyanate groups and at least one hydrophilic polyether chain and compounds with at least one group capable of salt formation optionally present at least in the partially neutralized form, and at least one group which is reactive towards isocyanate groups,
- d) at least one structural component which differs from a), b) and c) having a molecular weight from 32 to 500 and at least one group which is reactive towards isocyanate groups, and
- e) at least one monofunctional blocking agent,
- wherein component c) is present in sufficient quantity to provide a stable dispersion, and wherein component d) is present in sufficient amount such that the resulting dispersion contains, in addition to blocked isocyanate groups, reactive free hydroxyl and/or amino groups, and wherein the amount of reactive hydroxyl or amino groups from component d) must be greater than zero.
A self-crosslinking dispersion prepared from one of a polyurethane, a polyurethane-polyurea and a polyurea comprising the dispersed or dissolved reaction product of
- a) 35 to 75 wt. % of at least one polyol component,
- b) 15 to 40 wt. % of at least one diisocyanate component,
- c) 2 to 8 wt. % of a nonionic hydrophilic compound , having an ethylene oxide content of not more than 4.5 wt. %, and 0.5 to 7 wt. %. of an anionic compound,
- d) 1 to 11 wt. % of component d), and
- e) 0.2 to 6 wt. % of component e),
- wherein the sum of components a) to e) is 100%, and wherein the dispersion contains component d) in an amount such that the reactive free hydroxyl and/or amino groups comprise up to 2.5 wt. % based on the solids content of the dispersion.
A self-crosslinking dispersion prepared from one of a polyurethane, a polyurethane-polyurea and a polyurea comprising the dispersed or dissolved reaction product of
- a) at least one member selected from the group consisting of polycarbonate diols, polytetrahydrofuran diols and/or di- or trifunctional polypropylene glycols having a molecular weight from 300 to 3500, wherein a maximum of 8% of trifunctional polyols are contained, based on the total solids content,
- b) at least one di-, tri- and/or polyisocyanate component,
- c) at least one hydrophilic, nonionic or (potentially) ionic structural component selected from the group consisting of compounds with at least one group which is reactive towards isocyanate groups and at least one hydrophilic polyether chain and compounds with at least one group capable of salt formation optionally present at least in the partially neutralized form, and at least one group which is reactive towards isocyanate groups,
- d) at least one structural component which differs from a), b) and c) having a molecular weight from 32 to 500 and at least one group which is reactive towards isocyanate groups, and
- e) at least one monofunctional blocking agent,
- wherein component c) is present in sufficient quantity to provide a stable dispersion, and wherein component d) is present in sufficient amount such that the resulting dispersion contains, in addition to blocked isocyanate groups, reactive free hydroxyl and/or amino groups, wherein the amount of reactive hydroxyl or amino groups from component d) must be greater than zero.
A self-crosslinking disperse on prepared from one of a polyurethane, a polyurethane-polyurea and a polyurea comprising the dispersed or dissolved reaction product of
- a) at least one polyol component,
- b) at least one di-, tri- and/or polyisocyanate component,
- c) at least one hydrophilic, nonionic or (potentially) ionic structural component selected from the group consisting of compounds with at least one group which is reactive towards isocyanate groups and at least one hydrophilic polyether chain and compounds with at least one group capable of salt formation optionally present at least in the partially neutralized form, and at least one group which is reactive towards isocyanate groups,
- d) at least one structural component which differs from a), b) and c) having a molecular weight from 32 to 500 and at least one group which is reactive towards isocyanate groups, and
- e) at least one monofunctional blocking agent,
- wherein component c) is present in sufficient quantity to provide a stable dispersion, wherein component d) comprises hydroxyl groups which are introduced through the use of at least one hydroxyamine and is present in sufficient amount such that the resulting dispersion contains, in addition to blocked isocyanate groups, reactive free hydroxyl and/or amino groups, wherein the amount of reactive hydroxyl or amino groups from component d) must be greater than zero.
A self-crosslinking dispersion prepared from one of a polyurethane, a polyurethane-polyurea and a polyurea comprising the dispersed or dissolved reaction product of
- a) at least one polyol component,
- b) at least one di-, tri- and/or polyisocyanate component,
- c) at least one hydrophilic, nonionic or (potentially) ionic structural component selected from the group consisting of compounds with at least one group which is reactive towards isocyanate groups and at least one hydrophilic polyether chain and compounds with at least one group capable of salt formation optionally present at least in the partially neutralized form, and at least one group which is reactive towards isocyanate groups,
- d) at least one structural component which differs from a), b) and c) having a molecular weight from 32 to 500 and at least one group which is reactive towards isocyanate groups, and
- e) at least one monofunctional blocking agent,
- wherein component c) is present in sufficient quantity to provide a stable dispersion, and wherein component d) is present in sufficient amount such that the resulting dispersion contains, in addition to blocked isocyanate groups, reactive free hydroxyl and/or amino groups, wherein the amount of reactive hydroxyl or amino groups from component d) must be greater than zero and wherein the ratio of all the blocked isocyanate groups to free reactive hydroxyl and/or amino groups is 1.00:0.35 to 1.00:0.85.
A process for preparing the self-crosslinking dispersion comprising preparing an isocyanate-functional prepolymer from at least one polyol a), at least one isocyanate component b), a hydrophilic component c) or a component d), reacting a portion of the isocyanate groups with at least one blocking agent e), and reacting the remaining isocyanate groups with hydrophilic component c) and/or component d),wherein the hydrophilic component c) is present in sufficient quantity to provide a stable dispersion and wherein component d) is present in sufficient amount such a way that, in addition to blocked isocyanate groups, free reactive hydroxyl and/or amino groups are bound to the polymer In the self-crosslinking dispersion, wherein said dispersion is storage-stable at room temperature to 50° C. and reacts at 90 to 280° C. with crosslinking.
The process for the preparation of the self-crosslinking dispersion comprising preparing an isocyanatefunctional prepolymer in a first step from at least one polyol a), at least one isocyanate component b), optionally with the use of a hydrophilic component c) or a component d), reacting a part of the remaining isocyanate groups with at least one blocking agent e), and optionally reacting the other isocyanate groups either before, during or after the dispersion with hydrophilic components c) and/or components d), so that, in addition to blocked isocyanate groups, optionally free reactive hydroxyl and/or amino groups are bound to the polymer in the self-crosslinking dispersion, wherein said dispersion is storage-stable at room temperature to 50° C. and reacts at 90 to 280° C. with crosslinking.
A process of sizing a glass fiber comprising contacting a glass fiber with an effective amount of the self-crosslinking dispersion prepared from one of a polyurethane, a polyurethane-polyurea and a polyurea, the polymer having bound thereto blocked isocyanate groups and reactive hydroxyl or amino groups, wherein the dispersion is storage-stable at room temperature to 50° C. and reacts at 90 to 280° C. with crosslinking.
A glass fiber size comprising the self-crosslinking dispersion prepared from one of a polyurethane, a polyurethane-polyurea and a polyurea, the polymer having bound thereto blocked isocyanate groups and reactive hydroxyl or amino groups, wherein the dispersion is storage-stable at room temperature to 50° C. and reacts at 90 to 280° C. with crosslinking.
Dependencies are inferred from the claim text.