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    • 6. 发明授权
    • Distortion control additives for ultraviolet-curable compositions
    • 用于紫外线固化组合物的失真控制添加剂
    • US5498782A
    • 1996-03-12
    • US118014
    • 1993-09-08
    • Gary C. Rex
    • Gary C. Rex
    • C08F283/00C08F290/06C08G18/63C09D4/00C08F8/30C08L75/04C08L75/06
    • C08G18/637C08F283/006C08F290/067C09D4/00
    • Distortion control additives are disclosed which comprise a polyisocyanate, a polyol or polyol blend having a hydroxyl functionality of 2 to 3 hydroxyl groups per molecule and an average molecular weight of at least about 500 grams per gram mole, a diol chain extender having from about 2 to 35 carbon atoms per molecule and an acrylate or methacrylate having an acrylate functionality of from 1 to 5 acrylate groups per molecule. Ultraviolet-curable liquid compositions comprising an unsaturated polymeric resin, a monomer and the distortion control additives of the present invention are also disclosed. The distortion control additives can provide substantial reductions in distortion, e.g., shrinkage, of objects produced by ultraviolet curing, e.g., stereolithography.
    • 公开了失真控制添加剂,其包含每分子具有2-3个羟基官能团的多异氰酸酯,多元醇或多元醇共混物,平均分子量为至少约500克/克摩尔,二醇扩链剂具有约2 每分子具有35个碳原子的丙烯酸酯或甲基丙烯酸酯,丙烯酸酯官能度为每分子1至5个丙烯酸酯基团。 还公开了包含本发明的不饱和聚合物树脂,单体和变形控制添加剂的紫外线固化液体组合物。 变形控制添加剂可以显着减少通过紫外线固化产生的物体的变形,例如收缩,例如立体光刻。
    • 8. 发明授权
    • Tough polymeric mixtures
    • 坚韧的聚合物混合物
    • US5238744A
    • 1993-08-24
    • US819407
    • 1992-01-10
    • Jerry W. WilliamsRobert J. DeVoe
    • Jerry W. WilliamsRobert J. DeVoe
    • C08F2/48C08F2/50C08G18/63C09D4/00
    • C08G18/637C08F2/48C09D4/00Y10T428/31507Y10T428/31551Y10T428/31645Y10T428/31678Y10T428/31692
    • A tough polymeric mixture comprises the polymerized product of admixture I or II, whereinadmixture I comprises 5 to 45 weight percent of a first monomer and a photoinitiator therefor, said first monomer being at least one free-radically polymerizable monomer, and 95 to 55 weight percent of a second monomer and a photoinitiator therefor, said second monomer being at least one set of polyurethane precursors, andadmixture II comprises 5 to 45 weight percent of a first monomer and a photoinitiator therefor, said first monomer being at least one set of polyurethane precursors, and 95 to 55 weight percent of a second monomer and a photoinitiator therefor, said second monomer being at least one free-radically polymerizable monomer,said polymeric mixture having been prepared by a process involving two sequential actinic radiations of wavelength ranges centered around .lambda..sub.1 and .lambda..sub.2, respectively, wherein .lambda..sub.1 and .lambda..sub.2 differ from each other by at least 30 nm, andwherein the actinic radiation centered around .lambda..sub.1 does not substantially polymerize the second monomer, andwherein the area under a stress-strain curve as determined by ASTM D638-89 for said polymeric mixture is at least 10 percent greater, preferably 20 percent greater, and more preferably at least 50 percent greater when said precursor monomers are cured by said sequential photoinitiation process compared to when the same mixture is cured by a single photostage cure.
    • 韧性聚合物混合物包含混合物I或II的聚合产物,其中混合物I包含5至45重量%的第一单体和其引发剂,所述第一单体为至少一种可自由基聚合的单体,和95至55重量份 百分比的第二单体和光引发剂,所述第二单体是至少一组聚氨酯前体,并且混合物II包含5至45重量%的第一单体和其光引发剂,所述第一单体为至少一组聚氨酯 前体和95至55重量%的第二单体及其光引发剂,所述第二单体是至少一个可自由基聚合的单体,所述聚合物混合物已经通过涉及以λ为中心的波长范围的两个连续光化辐射 1和λ2,其中λ1和λ2彼此不同至少30nm,并且其中 以λ1为中心的光化辐射基本上不使第二单体聚合,并且其中根据ASTM D638-89对所述聚合物混合物测定的应力 - 应变曲线下的面积为至少10%,优选为20%,更优选为 当所述前体单体通过所述顺序光引发过程固化时相比,通过单次光固化固化相同的混合物时,至少50%以上。
    • 10. 发明授权
    • Polymeric mixtures and process therefor
    • 聚合物混合物及其工艺
    • US5102924A
    • 1992-04-07
    • US568088
    • 1990-08-16
    • Jerry W. WilliamsRobert J. DeVoe
    • Jerry W. WilliamsRobert J. DeVoe
    • C08F2/48C08F2/50C08F4/00C08G18/63C09D4/00
    • C08G18/637C08F2/48C09D4/00
    • A tough polymeric mixture comprises the polymerized product of admixture I or II, whereinadmixture I comprises 5 to 45 weight percent of a first monomer and a photoinitiator therefor, said first monomer being at least one free-radically polymerizable monomer, and 95 to 55 weight percent of a second monomer and a photoinitiator therefor, said second monomer being at least one set of polyurethane precursors, andadmixture II comprises 5 to 45 weight percent of a first monomer and a photoinitiator therefor, said first monomer being at least one set of polyurethane precursors, and 95 to 55 weight percent of a second monomer and a photoinitiator therefor, said second monomer being at least one free-radically polymerizable monomer,said polymeric mixture having been prepared by a process involving two sequential actinic radiations of wavelengths ranges centered around .lambda..sub.1 and .lambda..sub.2, respectively, wherein .lambda..sub.1 and .lambda..sub.2 differ from each other by at least 30 nm, andwherein the actinic radiation centered .lambda..sub.1 does not substantialy polymerize the second monomer, andwherein the area under a stress-strain curve as determined by ASTM D638-89 for said polymeric mixture is at least 10 percent greater, preferably 20 percent greater, and more preferably at least 50 percent greater when said precursor monomers are cured by said sequential photoinitiation process compared to when the same mixture is cured by a single photostage cure.
    • 韧性聚合物混合物包含混合物I或II的聚合产物,其中混合物I包含5至45重量%的第一单体和其引发剂,所述第一单体为至少一种可自由基聚合的单体,和95至55重量份 百分比的第二单体和光引发剂,所述第二单体是至少一组聚氨酯前体,并且混合物II包含5至45重量%的第一单体和其光引发剂,所述第一单体为至少一组聚氨酯 前体和95至55重量%的第二单体及其光引发剂,所述第二单体是至少一个可自由基聚合的单体,所述聚合物混合物已经通过涉及波长范围以λ为中心的两个连续光化辐射的方法制备 1和λ2,其中λ1和λ2彼此不同至少30nm,并且其中 光化辐射居中的λ1不会基本上聚合第二单体,并且其中通过ASTM D638-89测定的针对所述聚合物混合物的应力 - 应变曲线下的面积至少为10%,优选为20%,更优选为 当所述前体单体通过所述顺序光引发过程固化时相比,通过单次光固化固化相同的混合物时,其最大50%更大。