Shpp Global Technologies B.v.

Elena Miloskovska

Bruke Jofore

Vandita Pai-Paranjape

Hao Gu

Raul Fernandez Cabello

Robert Russell Gallucci

Viswanathan Kalyanaraman

Brian Gray Price

In a method of forming a semicrystalline polyetherimide, a solvent mixture is combined with an amorphous polyetherimide in a weight ratio of 1:1 to 50:1, respectively, to form a first dispersion. The solvent mixture includes dichloromethane and a C-Calkanol in a weight ratio of 0.5:1 to 15:1, respectively. The first dispersion is agitated to form a second dispersion containing a semicrystalline polyetherimide, and the semicrystalline polyetherimide is isolated from the second dispersion. The isolated semicrystalline polyetherimide exhibits a melting point in a range of 230 to 300° C. Also described is a composition that includes a polyetherimide, dichloromethane, and a C-Calkanol in specific ratios.

Method of forming semicrystalline polyetherimide, and polyetherimide-containing composition

A semicrystalline polyphenylsulfone, has the structure Formula (I) wherein n and R are defined herein. The semicrystalline polyphenylsulfone, which exhibits a crystalline melting point in a range of 215 to 270&#xb0; C., can be prepared from amorphous polyphenylsulfone using a solvent-induced crystallization method. An additive manufacturing method utilizing particles of the semicrystalline polyphenylsulfone is described. 

Semicrystalline polyphenylsulfone and associated method of making and method of additive manufacturing

Provided are compositions including a population of particulates that comprise an at least partially crystalline polycarbonate having an average cross-sectional dimension of from about 1 to about 200 &#x3bc;m, and have a weight-average molecular weight, per polystyrene standards, of from about 17,000 to about 40,000 Daltons. The composition exhibits a zero-shear viscosity of less than about 10Pa&#xb7;s at the melting temperature of the partially crystalline polycarbonate. Related systems and methods for utilizing these compositions in additive manufacturing applications, including selective laser sintering (SLS) applications, are also disclosed. Also provided are additively-manufactured articles made with the disclosed compositions and according to the disclosed methods.

Crystalline polycarbonate powders for powder bed fusion in additive manufacturing

Provided are amorphous and at least partially crystalline polyetherimide compositions having a comparatively narrow particle size distribution and are particularly suited for additive manufacturing processes. The compositions comprise a population of polyetherimide particulates are characterized as having a zero-shear viscosity sufficiently low so as to achieve a coalescence of at least 0.5, and preferably of about 1.0, as characterized by the Frenkel model at a temperature less than 450&#xb0; C.

Polyetherimide powders for additive manufacturing

Provided are compositions comprising partially crystalline polycarbonate particulate having an average cross-sectional dimension of from about 1 &#x3bc;&#x3b9;&#x3b7; to about 200 &#x3bc;&#x3b9;&#x3c4;&#x3b9;, having from about 10% crystallinity to about 50% crystallinity, and having a weight-average molecular weight, per polystyrene standards, of from about 17,000 to about 40,000 Daltons. The composition exhibits a zero-shear viscosity of less than about 104 Pa s at the melting temperature of the partially crystalline polycarbonate. Related systems and methods for utilizing these compositions in additive manufacturing applications, including selective laser sintering (SLS) applications, are also disclosed. Also provided are additively-manufactured articles made with the disclosed compositions and according to the disclosed methods.

A composition for use in powder bed fusion includes a thermoplastic powder that itself includes an induced crystalline polycarbonate or an induced crystalline polyetherimide. The thermoplastic powder is recycled powder, which means that it is recovered from a powder bed that had undergone a powder bed fusion process. Also described is a method of making an article, the method including: placing an induced crystalline polymeric (polycarbonate or polyetherimide) powder in a powder bed, fusing a portion of the induced crystalline polymeric powder in the powder bed, recovering a least a portion of the crystalline polymeric powder from the powder bed, wherein the recovered powder is not fused, placing the recovered induced crystalline polymeric powder in a second powder bed, and fusing at least a portion of the recovered induced crystalline polymeric powder in the second powder bed to form an amorphous polymer article.

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Breda, Netherlands

Elena Miloskovska