The present invention provides CMP polishing pads or layers having a unfilled Shore D (2 second) hardness of from 57-77 or a filled Shore D (2 second) hardness of from 18-50, made from a two-component reaction mixture of (i) a liquid aromatic isocyanate component comprising one or more aromatic diisocyanates or a linear aromatic isocyanate-terminated urethane prepolymer having an unreacted isocyanate (NCO) concentration of from 18 to 47 wt. %, based on the total solids weight of the aromatic isocyanate component, and (ii) a liquid polyol component including one or more curatives selected from the group of amines defined by Formulas (I) and (II).

A materials kit for three-dimensional (3D) printing can include a powder bed material comprising thermoplastic polyurethane particles and a fusing agent including a radiation absorber to selectively apply to the powder bed material. The thermoplastic polyurethane particles can have an average particle size from about 20 μm to about 120 μm and a melting temperature of from about 100° C. to about 250° C., wherein the thermoplastic polyurethane particles include polyurethane polymer strands having an average of about 10 wt % to about 30 wt % hard segments based on a total weight of the thermoplastic polyurethane particles. The hard segments can include a symmetrical aliphatic diisocyanate and a symmetrical aliphatic chain extender that are polymerized into the thermoplastic polyurethane particles.

A materials kit for three-dimensional (3D) printing can include a powder bed material comprising thermoplastic polyurethane particles and a fusing agent including a radiation absorber to selectively apply to the powder bed material. The thermoplastic polyurethane particles can have an average particle size from about 20 μm to about 120 μm and a melting temperature of from about 100° C. to about 250° C., wherein the thermoplastic polyurethane particles include polyurethane polymer strands having an average of about 10 wt % to about 30 wt % hard segments based on a total weight of the thermoplastic polyurethane particles. The hard segments can include a symmetrical aliphatic diisocyanate and a symmetrical aliphatic chain extender that are polymerized into the thermoplastic polyurethane particles.

A polythiol composition according to exemplary embodiments includes at least two different polythiol-based compounds, wherein a peak area (%) of the polythiol compound represented by C8H18S6, which is measured through a high performance liquid chromatographic (HPLC) analysis graph obtained at a wavelength of 230 nm, ranges from 0.90% to 1.30%. By controlling the sub-polythiol compound, an optical product having excellent transmittance and optical properties can be manufactured.

A thermoplastic polyurethane can be obtained by a process involving a reaction of a thermoplastic polyester (PE-1) with a diamine (D1), to obtain a composition (Z1) containing an amide (PA-1), and a reaction of the obtained composition (Z1) with an isocyanate composition (I1), containing at least one polyisocyanate, and a polyol composition (P1). The diamine (D1) has a molecular weight in the range from 50 g/mol to 700 g/mol. A process can produce such a thermoplastic polyurethane, and shaped articles can be made containing the thermoplastic polyurethane.

The present invention provides a solution-processable self-healing hydrolytically stable elastomer, a method for the preparation thereof, and articles of manufacture comprising the elastomer. The elastomer comprises polymeric chains comprising units of formula (A1), wherein R is a polybutadiene-containing polyurethane; R.sub.1 and R.sub.1′ are independently selected from the group consisting of: —H, (C.sub.1-C.sub.20)alkyl, (C.sub.5-C.sub.14)aryl, —OR.sub.4, —(CO)R.sub.5, —O(CO)R.sub.6, —(SO)R.sub.7, CO—R.sub.8, —COOR.sub.9, —NO.sub.2, and halogen; R.sub.2, R.sub.2′, R.sub.3 and R.sub.3′ are independently selected from the group consisting of: —H, (C.sub.1-C.sub.20)alkyl, and (C.sub.5-C.sub.14)aryl; R.sub.4 to R.sub.9 are the same or different, and are independently selected from the group consisting of: —H, (C.sub.1-C.sub.20)alkyl, and (C.sub.5-C.sub.14)aryl; m is 4; wherein the elastomer is dynamically crosslinked by aromatic disulfide metathesis, and wherein the elastomer has a water contact angle of above 100 #.

##STR00001##

The present invention provides a solution-processable self-healing hydrolytically stable elastomer, a method for the preparation thereof, and articles of manufacture comprising the elastomer. The elastomer comprises polymeric chains comprising units of formula (A1), wherein R is a polybutadiene-containing polyurethane; R.sub.1 and R.sub.1′ are independently selected from the group consisting of: —H, (C.sub.1-C.sub.20)alkyl, (C.sub.5-C.sub.14)aryl, —OR.sub.4, —(CO)R.sub.5, —O(CO)R.sub.6, —(SO)R.sub.7, CO—R.sub.8, —COOR.sub.9, —NO.sub.2, and halogen; R.sub.2, R.sub.2′, R.sub.3 and R.sub.3′ are independently selected from the group consisting of: —H, (C.sub.1-C.sub.20)alkyl, and (C.sub.5-C.sub.14)aryl; R.sub.4 to R.sub.9 are the same or different, and are independently selected from the group consisting of: —H, (C.sub.1-C.sub.20)alkyl, and (C.sub.5-C.sub.14)aryl; m is 4; wherein the elastomer is dynamically crosslinked by aromatic disulfide metathesis, and wherein the elastomer has a water contact angle of above 100 #.

##STR00001##

The present invention provides CMP polishing pads or layers having a unfilled Shore D (2 second) hardness of from 57-77 or a filled Shore D (2 second) hardness of from 18-50, made from a two-component reaction mixture of (i) a liquid aromatic isocyanate component comprising one or more aromatic diisocyanates or a linear aromatic isocyanate-terminated urethane prepolymer having an unreacted isocyanate (NCO) concentration of from 18 to 47 wt. %, based on the total solids weight of the aromatic isocyanate component, and (ii) a liquid polyol component including one or more curatives selected from the group of amines defined by Formulas (I) and (II).

The present invention provides CMP polishing pads or layers having a unfilled Shore D (2 second) hardness of from 57-77 or a filled Shore D (2 second) hardness of from 18-50, made from a two-component reaction mixture of (i) a liquid aromatic isocyanate component comprising one or more aromatic diisocyanates or a linear aromatic isocyanate-terminated urethane prepolymer having an unreacted isocyanate (NCO) concentration of from 18 to 47 wt. %, based on the total solids weight of the aromatic isocyanate component, and (ii) a liquid polyol component including one or more curatives selected from the group of amines defined by Formulas (I) and (II).

A self-restoring polyurethane-based polymer obtained by polymerization of a composition containing an aromatic disulfide diol represented by Chemical Formula, HO—Ar.sub.1—S—S—Ar.sub.2—OH, an alicyclic polyisocyanate, and a polyol. Ar.sub.1 and Ar.sub.2 each are independently a substituted or unsubstituted C.sub.6-C.sub.30 arylene group. The composition satisfies Equation, 0.1≤M.sub.[disulfide]/M.sub.[OH]. M.sub.[disulfide] is a total mole number of the aromatic disulfide diol in the composition, and M.sub.[OH] is a total mole number of the aromatic disulfide diol and the polyol in the composition.